Online Celsius to Kelvin conversion

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Celsius to Kelvin conversion

Celsius (°C) to Kelvin (K) temperature conversion calculator and how to convert.

Celsius to Kelvin converter

°C
 
Kelvin: K
Calculation:  

Kelvin to Celsius ►

How to convert Celsius to Kelvin

0 degrees Celsius is equal to 273.15 degrees Kelvin:

0 °C = 273.15 K

The temperature T in Kelvin (K) is equal to the temperature T in degrees Celsius (°C) plus 273.15:

T(K) = T(°C) + 273.15

Example

Convert 20 degrees Celsius to Kelvin:

T(K) = 20°C + 273.15 = 293.15 K

Celsius to Kelvin conversion table

Celsius (°C) Kelvin (K) Description
-273.15 °C 0 K absolute zero temperature
-50 °C 223.15 K  
-40 °C 233.15 K  
-30 °C 243.15 K  
-20 °C 253.15 K  
-10 °C 263.15 K  
0 °C 273.15 K freezing/melting point of water
10 °C 283.15 K  
20 °C 293.15 K  
21 °C 294.15 K room temperature
30 °C 303.15 K  
37 °C 310.15 K average body temperature
40 °C 313.15 K  
50 °C 323.15 K  
60 °C 333.15 K  
70 °C 343.15 K  
80 °C 353.15 K  
90 °C 363.15 K  
100 °C 373.15 K boiling point of water
200 °C 473.15 K  
300 °C 573.15 K  
400 °C 673.15 K  
500 °C 773.15 K  
600 °C 873.15 K  
700 °C 973.15 K  
800 °C 1073.15 K  
900 °C 1173.15 K  
1000 °C 1273.15 K  

 

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Online Temperature Calculators

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Temperature Calculators

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1. Celsius to Fahrenheit

Celsius to Fahrenheit conversion is probably the most confusing conversion there is, but a simple °C to °F conversion is actually quite easy – just double the °C figure and add 30. This should be reasonably accurate for weather temperatures.

Absolute Zero -273.15°C -459.67°F
Parity -40.00°C -40°F
Freezing point 0°C 32°F
Body Temperature 37°C 98.6°F
Boiling point 100°C 212°F

For example, to convert 50 degrees Celsius (centigrade) to Fahrenheit, we plug our numbers into the formula as shown below: F = C * 9/5 + 32

F = 50 * 9/5 + 32

F = 90 + 32

F = 122

50 degrees Celsius is equal to 122 degrees Fahrenheit.

Celsius and Fahrenheit definition

The Celsius temperature range was originally defined by setting zero as the temperature at which water froze. Zero degrees C was later redefined as the temperature at which ice melts. The other point at which Celsius was set – 100 degrees Celsius – was defined as the boiling point of water.

Since its definition, the Celsius scale has been redefined to peg it to Kelvin. Zero degrees Celsius is now defined as 273.15K. As one degree Celsius is equal to one Kelvin, boiling point of water is equal to 273.15 + 100 = 373.15 Kelvin.

The Fahrenheit temperature range is based on setting the freezing point of water at 32 degrees, and boiling to 212 degrees. This means that boiling and freezing point are 180 degrees apart. Absolute zero is defined as -459.67°F.

Celsius to Fahrenheit formula

°F =°C * 1.8000+ 32.00

Why is converting Celsius to Fahrenheit so difficult?

Because both Celsius and Fahrenheit scales are offset– ie neither are defined as starting at zero. On top of that, for every additional unit of heat energy the Celsius and Fahrenheit scales add a different additional value. Because of this setup, it’s impossible to say that doubling the °C or °F value doubles the amount of heat energy, so it’s difficult to get an intuitive grasp of how much energy 1 degree Fahrenheit or Celsius actually is.

The only temperature system that works intuitively – where a doubling of value doubles the energy – is Kelvin, where absolute zero is 0, body temperature is 310.15K and boiling water is 373.15K. The problem with the Kelvin scale is that the zero end of the scale is too far from human experience to be useful – as anyone who set their room temperature to 20.5 Kelvin would attest, if they lived long enough.

2. Celsius to Kelvin

Although initially defined by the freezing point of water (and later the melting point of ice), the Celsius scale is now officially a derived scale, defined in relation to the Kelvin temperature scale.

Zero on the Celsius scale (0°C) is now defined as the equivalent to 273.15K, with a temperature difference of 1 deg C equivalent to a difference of 1K, meaning the unit size in each scale is the same. This means that 100°C, previously defined as the boiling point of water, is now defined as the equivalent to 373.15K.

Celsius

The Celsius scale is an interval system but not a ratio system, meaning it follows a relative scale but not an absolute scale. This can be seen because the temperature interval between 20°C and 30°C is the same as between 30°C and 40°C, but 40°C does not have twice the air heat energy of 20°C.

A temperature difference of 1 deg C is the equivalent of a temperature difference 1.8°F.

Celsius to Kelvin formula

K =°C+ 273.15

Kelvin

Based upon the definitions of the Centigrade scale and the experimental evidence that absolute zero is -273.15ºC.

Celsius and Kelvin are the two most important temperature scales for scientific measurements. Fortunately, it's easy to convert between them because the two scales have the same size degree. All that is needed to convert Celsius to Kelvin is one simple step.

Celsius to Kelvin Conversion Formula

Take your Celsius temperature and add 273.15.

K = °C + 273.15

Your answer will be in Kelvin.

Remember, the Kelvin temperature scale does not use the degree (°) symbol. The reason is because Kelvin is an absolute scale, based on absolute zero, while the zero on the Celsius scale is based on the properties of water.

Also, measurements given in Kelvin will always be larger numbers than in Celsius.

Celsius to Kelvin Conversion Examples

For example, if you want to know what 20°C is in Kelvin:

K = 20 + 273.15 = 293.15 K

If you want to know what -25.7°C is in Kelvin:

K = -25.7 + 273.15, which may be rewritten as:

K = 273.15 - 25.7 = 247.45 K


3. Celsius to Rankine

Convert degrees Celsius to degrees Rankine with this simple formula:

degrees Rankine = ( [°C] + 273.15 ) × 9 / 5

Insert the [°C] temperature measurement in the formula and then solve to find the result.

For example, let's convert 50 °C to degrees Rankine:

50 °C = ( ( 50 + 273.15 ) × 9 / 5 ) = 581.67 °R

The Celsius scale and the Rankine scale are both used to measure temperature. Read on to learn more about each of them.

Celsius

The Celsius temperature scale, also commonly referred to as the centigrade scale, is defined in relation to the kelvin. Specifically, degrees Celsius is equal to kelvins minus 273.15.[1]

The degree Celsius is the SI derived unit for temperature in the metric system. A degree Celsius is sometimes also referred to as a degree centigrade. Celsius can be abbreviated as C; for example, 1 degree Celsius can be written as 1 °C.

Important Temperatures In Degrees Celsius

Temperature Degrees Celsius
Absolute Zero -273.15 °C
Freezing Point of Water 0 °C
Triple Point of Water 0.01 °C
Boiling Point of Water 100 °C

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

4. Fahrenheit to Celsius

Fahrenheit and Celsius are the scales most often used for reporting room, weather, and water temperatures. The Fahrenheit scale is used in the United States, while the Celsius scale is used worldwide.

Indeed, most countries around the world measure their weather and temperatures using the relatively simple Celsius scale. But the United States is one of just a few remaining countries that use Fahrenheit, so it's important for Americans to know how to convert one to the other, especially when traveling or doing scientific research.

Fahrenheit

The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, 212°F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into 180 equal parts.

Celsius

The Celsius (symbol: °C) is an SI (International System of Units) derived unit of temperature. It is defined based on the SI unit of temperature, the kelvin. The Celsius and Kelvin scales are precisely related, with a one-degree change in Celsius being equal to a one degree-change in kelvin. The kelvin (and thus Celsius) is defined based on the Boltzmann constant, k, which equals 1.380649 × 10-23 when expressed in the unit J·K-1, a unit equivalent to kg·m2·s-2·K-1. The kilogram, meter, and second, are defined based on Planck's constant, h, the speed of light, c, and cesium frequency, ΔνCs.

How to Convert Temperatures

First, you need the formula for converting Fahrenheit (F) to Celsius (C):

C = 5/9 x (F-32)

The notation C represents the temperature in Celsius, and F is the temperature in Fahrenheit. After you know the formula, it is easy to convert Fahrenheit to Celsius with these three steps.

1) Subtract 32 from the Fahrenheit temperature.

2) Multiply this number by five.

3) Divide the result by nine.

For example, suppose the temperature is 80 degrees Fahrenheit and you want to know what the figure would be in Celsius. Use the above three steps:

1) 80 F – 32 = 48

2) 5 x 48 = 240

3) 240 / 9 = 26.7 C


5. Fahrenheit to Kelvin

Fahrenheit and Kelvin are both units of measurement for temperature. Fahrenheit is often used for surface temperatures in the United States, and Kelvin is often used for scientific equations and calculations. It’s possible to convert temperatures from Fahrenheit to Kelvin, and vice versa. There are two ways that you can make the conversion, either converting directly to Kelvin, or converting to Celsius and then converting that measurement to Kelvin.

Fahrenheit

The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, 212°F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into 180 equal parts.

Kelvin

The kelvin (symbol: K) is the base unit of thermodynamic temperature in the International System of Units (SI). It is defined as the energy equivalent of the triple point of water as given by Boltzmann's equation. It is also the unit of the Kelvin scale in which the null point (0 K) is the temperature at which all thermal motion ceases, known as absolute zero, or -273.15°C. The definition of the kelvin was changed in 2019. This new definition results in a fundamental change in the kelvin, such that it is now dependent on the definitions of the second, the meter, and the kilogram.

How to Convert Fahrenheit to Kelvin

K = 5/9(F + 459.67)

F = 9/5(K - 459.67)

Example:

Convert 50 °F to K:

50 °F = (50 + 459.67) × 5/9 = 283.15

Setting Fahrenheit and Celsius Equal

Rather than converting one temperature to another (which is not helpful because it assumes you already know the answer), you can set degrees Celsius and degrees Fahrenheit equal to each other using the conversion formula between the two scales:

°F = (°C * 9/5) + 32

°C = (°F - 32) * 5/9

It does not matter which equation you use; simply use x instead of degrees Celsius and Fahrenheit. You can solve this problem by solving for x:

°C = 5/9 * (°F - 32)

x = 5/9 * (x - 32)

x = (5/9)x - 17.778

1x - (5/9)x = -17.778

0.444x = -17.778

x = -40 degrees Celsius or Fahrenheit

Working using the other equation, you get the same answer:

°F = (°C * 9/5) + 32

°x - (°x * 9/5) = 32

-4/5 * °x = 32

°x = -32 * 5/4

x = -40°

6. Fahrenheit to Rankine

Fahrenheit is a temperature scale named after the German physicist Gabriel Fahrenheit (1686–1736), who proposed it in 1724. Rankine is a thermodynamic (absolute) temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.

Convert degrees Fahrenheit to degrees Rankine with this simple formula:

degrees Rankine = [°F] + 459.67

Insert the [°F] temperature measurement in the formula and then solve to find the result.

For example

let's convert 50 °F to degrees Rankine:

50 °F = ( 50 + 459.67 ) = 509.67 °R

The Fahrenheit scale and the Rankine scale are both used to measure temperature.

Fahrenheit

The Fahrenheit scale is a temperature scale that defines the melting point of water as 32 degrees and the boiling point of water at 212 degrees. There are 180 intervals between 32 °F and 212 °F, each corresponding to one degree.

The degree Fahrenheit is a US customary and imperial unit of temperature. Fahrenheit can be abbreviated as F; for example, 1 degree Fahrenheit can be written as 1 °F.

Important Temperatures In Degrees Fahrenheit

Temperature Degrees Fahrenheit
Absolute Zero -459.67 °F
Freezing Point of Water 32 °F
Triple Point of Water 32.018 °F
Boiling Point of Water 212 °F

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

7. Kelvin to Celsius

Kelvin and Celsius are two temperature scales. The size of the "degree" for each scale is the same magnitude, but the Kelvin scale starts at absolute zero (the lowest temperature theoretically attainable), while the Celsius scale sets its zero point at the triple point of water (the point at which water can exist in solid, liquid, or gaseous states, or 32.01 F).

Conversion Formula

The formula to convert Kelvin into Celsius is C = K - 273.15. All that is needed to convert Kelvin to Celsius is one simple step:

Take your Kelvin temperature and subtract 273.15. Your answer will be in Celsius. The K does not use the word degree or the symbol; depending on the context, generally one or the other (or simply C) is used to report a Celsius temperature.

Kelvin to Celsius

How many degrees Celsius is 500 K?

C = 500 - 273.15

500 K = 226.85 C

Let's convert normal body temperature from Kelvin to Celsius. Human body temperature is 310.15 K. Put the value into the equation to solve for degrees Celsius:

C = K - 273.15

C = 310.15 - 273.15

Human body temperature = 37 C

Reverse Conversion: Celsius to Kelvin

Similarly, it's easy to convert a Celsius temperature to the Kelvin scale. You can either use the formula given above or use K = C + 273.15.

For example, let's convert the boiling point of water to Kelvin. The boiling point of water is 100 C. Plug the value into the formula:

K = 100 + 273.15

K = 373.15

About Absolute Zero

While typical temperatures experienced in daily life are often expressed in Celsius or Fahrenheit, many phenomena are described more easily using an absolute temperature scale. The Kelvin scale starts at absolute zero (the coldest temperature attainable) and is based on energy measurement (the movement of molecules). The Kelvin is the international standard for scientific temperature measurement, and is used in many fields, including astronomy and physics.

While it's perfectly normal to get negative values for Celsius temperature, the Kelvin scale only goes down to zero. Zero K is also known as absolute zero. It is the point at which no further heat can be removed from a system because there is no molecular movement, so there is no lower temperature possible.

8. Kelvin to Fahrenheit

The kelvin (symbol: K) is the base unit of thermodynamic temperature in the International System of Units (SI). It is defined as the energy equivalent of the triple point of water as given by Boltzmann's equation. It is also the unit of the Kelvin scale in which the null point (0 K) is the temperature at which all thermal motion ceases, known as absolute zero, or -273.15°C. The definition of the kelvin was changed in 2019. This new definition results in a fundamental change in the kelvin, such that it is now dependent on the definitions of the second, the meter, and the kilogram.

The kelvin is used worldwide, particularly in science and engineering, together with the Celsius. This is partially due to the kelvin and the Celsius degree having exactly the same magnitude. Unlike the Celsius and Fahrenheit, the kelvin is not used in meteorological contexts.

The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, 212°F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into 180 equal parts.

Until the 1960's the Fahrenheit scale was the primary scale used in English-speaking countries. Today, most countries around the world use the Celsius temperature scale instead, many having made the change during their metrication processes (conversion to using the metric system of units). However, the Fahrenheit scale is still used as the official temperature scale in a number of countries, including the United States (as well as its unincorporated territories), the Bahamas, Belize, the Cayman Islands, and a few others.

Kelvin to Fahrenheit Conversion Formula

Here is the formula to convert Kelvin to Fahrenheit:

° F = 9/5(K - 273) + 32

or you may see the equation using more significant figures as:

° F = 9/5(K - 273.15) + 32

or

° F = 1.8(K - 273) + 32

You can use whichever equation you prefer.

It is easy to convert Kelvin to Fahrenheit with these four steps.

1) Subtract 273.15 from your Kelvin temperature

2) Multiply this number by 1.8 (this is the decimal value of 9/5).

3) Add 32 to this number.

Your answer will be the temperature in degrees Fahrenheit

Kelvin to Fahrenheit Conversion Example

Let's try a sample problem, converting room temperature in Kelvin to degrees Fahrenheit. Room temperature is 293K.

Start with the equation (I chose the one with fewer significant figures):

° F = 9/5(K - 273) + 32

Plug in the value for Kelvin:

F = 9/5(293 - 273) + 32

Doing the math:

F = 9/5(20) + 32

F = 36 + 32

F = 68

Fahrenheit is expressed using degrees, so the answer is that room temperature is 68° F.


9. Kelvin to Rankine

A ºF version of the Kelvin scale. Based upon the definitions of the Fahrenheit scale and the experimental evidence that absolute zero is -459.67ºF. Based upon the definitions of the Centigrade scale and the experimental evidence that absolute zero is -273.15ºC

Convert kelvins to degrees Rankine with this simple formula:

degrees Rankine = [K] × 9 / 5

Insert the [K] temperature measurement in the formula and then solve to find the result.

For example

let's convert 50 K to degrees Rankine:

50 K = ( 50 × 9 / 5 ) = 90 °R

Kelvins and the Rankine scale are both used to measure temperature.

Kelvins

The Kelvin scale is an absolute temperature scale that uses absolute zero as the starting point. The kelvin is defined in terms of the Boltzmann constant, which is a measure of the energy of motion corresponding to one kelvin.

More specifically, one kelvin is equal to the change of thermodynamic temperature that results in a change of thermal energy kT by 1.380649 × 10−23 J.

0 kelvins are equal to −273.15 degrees Celsius, which is the point of absolute zero.

The kelvin is the SI base unit for temperature in the metric system. Kelvins can be abbreviated as K; for example, 1 kelvin can be written as 1 K.

The kelvin scale is different from other temperature scales in that it is not expressed in degrees, values are expressed in kelvins. When using the Kelvin scale in writing, the "k" is capitalized, however when using the kelvin as a unit the "k" should be lower-case, even though it is named for a person.

Important Temperatures In Kelvins

Temperature Kelvins
Absolute Zero 0 K
Freezing Point of Water 273.15 K
Triple Point of Water 273.16 K
Boiling Point of Water 373.15 K

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

10. Rankine to Celsius

Rankine to Celsius converter above calculates how many Celsius are in 'X' Rankine (where 'X' is the number of Rankine to convert to Celsius). In order to convert a value from Rankine to Celsius (from °R to °C) simply type the number of °R to be converted to °C and then click on the 'convert' button.

Convert degrees Rankine to degrees Celsius with this simple formula:

degrees Celsius = ( [°R] - 491.67 ) × 5 / 9

Insert the [°R] temperature measurement in the formula and then solve to find the result.

For example

let's convert 50 °R to degrees Celsius:

50 °R = ( ( 50 - 491.67 ) × 5 / 9 ) = -245.372222 °C

The Rankine scale and the Celsius scale are both used to measure temperature. Read on to learn more about each of them.

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

Celsius

The Celsius temperature scale, also commonly referred to as the centigrade scale, is defined in relation to the kelvin. Specifically, degrees Celsius is equal to kelvins minus 273.15.

The degree Celsius is the SI derived unit for temperature in the metric system. A degree Celsius is sometimes also referred to as a degree centigrade. Celsius can be abbreviated as C; for example, 1 degree Celsius can be written as 1 °C.

Important Temperatures In Degrees Celsius

Temperature Degrees Celsius
Absolute Zero -273.15 °C
Freezing Point of Water 0 °C
Triple Point of Water 0.01 °C
Boiling Point of Water 100 °C

11. Rankine to Fahrenheit

Rankine and Fahrenheit are both used to measure temperature, however rankine is used more industrially and is similar to the kelvin. Zero on the Rankine and Kelvin scale both signify absolute zero for all thermal activity. Fahrenheit is a more commercial unit that people use everyday. Degrees Fahrenheit is favoured in the United States over Celsius.

Convert degrees Rankine to degrees Fahrenheit with this simple formula:

degrees Fahrenheit = [°R] - 459.67

Insert the [°R] temperature measurement in the formula and then solve to find the result.

For example

let's convert 50 °R to degrees Fahrenheit:

50 °R = ( 50 - 459.67 ) = -409.67 °F

The Rankine scale and the Fahrenheit scale are both used to measure temperature. Read on to learn more about each of them.

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

Fahrenheit

The Fahrenheit scale is a temperature scale that defines the melting point of water as 32 degrees and the boiling point of water at 212 degrees.[1] There are 180 intervals between 32 °F and 212 °F, each corresponding to one degree.

The degree Fahrenheit is a US customary and imperial unit of temperature. Fahrenheit can be abbreviated as F; for example, 1 degree Fahrenheit can be written as 1 °F.

Important Temperatures In Degrees Fahrenheit

Temperature Degrees Fahrenheit
Absolute Zero -459.67 °F
Freezing Point of Water 32 °F
Triple Point of Water 32.018 °F
Boiling Point of Water 212 °F

12. Rankine to Kelvins

The Rankine scale is named after Scottish physicist William John Macquorn Rankine. Similarly to kelvin absolute zero is 0 °R, equivalent to -459.67 °F. Rankine uses the same interval as Fahrenheit. Kelvin is the unit of measure for temperature adopted by the International System of Units. Absolute zero is 0 K, equivalent to -273.15 °C. Kelvin uses the same interval as Celsius.

Convert degrees Rankine to kelvins with this simple formula:

kelvins = [°R] × 5 / 9

Insert the [°R] temperature measurement in the formula and then solve to find the result.

For example

let's convert 50 °R to kelvins:

50 °R = ( 50 × 5 / 9 ) = 27.777778 K

The Rankine scale and Kelvins are both used to measure temperature.

Rankine

The Rankine scale is an absolute temperature scale that uses absolute zero as the starting point, much like the Kelvin scale. The key difference between the Rankine scale and the Kelvin scale is that an increment of one degree rankine is equal to an increment of one degree Fahrenheit, not Celsius as in the Kelvin scale. The base of the Rankine scale starts at absolute zero, thus 0 degrees rankine are equal to −459.67 degrees Fahrenheit.

Rankine can be abbreviated as R, and are also sometimes abbreviated as Ra. For example, 1 degree Rankine can be written as 1 °R or 1 Ra.

Important Temperatures In Degrees Rankine

Temperature Degrees Rankine
Absolute Zero 0 °R
Freezing Point of Water 491.67 °R
Triple Point of Water 491.688 °R
Boiling Point of Water 671.67 °R

Kelvins

The Kelvin scale is an absolute temperature scale that uses absolute zero as the starting point. The kelvin is defined in terms of the Boltzmann constant, which is a measure of the energy of motion corresponding to one kelvin.

More specifically, one kelvin is equal to the change of thermodynamic temperature that results in a change of thermal energy kT by 1.380649 × 10−23 J.

0 kelvins are equal to −273.15 degrees Celsius, which is the point of absolute zero.

The kelvin is the SI base unit for temperature in the metric system. Kelvins can be abbreviated as K; for example, 1 kelvin can be written as 1 K.

The kelvin scale is different from other temperature scales in that it is not expressed in degrees, values are expressed in kelvins. When using the Kelvin scale in writing, the "k" is capitalized, however when using the kelvin as a unit the "k" should be lower-case, even though it is named for a person.

Important Temperatures In Kelvins

Temperature Kelvins
Absolute Zero 0 K
Freezing Point of Water 273.15 K
Triple Point of Water 273.16 K
Boiling Point of Water 373.15 K