Celsius

Celsius or centigrade is a unit of measurement of temperature.

The freezing/melting point of water is about zero degrees celsius (0 C) at a pressure of 1 atmosphere.

The boiling point of water is about on one hundred degrees celsius (100 C) at a pressure of 1 atmosphere.

The exact values depend on the water composition (usually the amount of salt) and the air pressure.

Seawater contains salt and the freezing point is reduced below 0 C.

When boiling water on a mountain above sea level the boiling point is reduced below 100 C.

The symbol of Celsius degrees is C.

Celsius to Fahrenheit conversion

0 degrees Celsius is equal to 32 degrees Fahrenheit:

0 C = 32 F

The temperature T in degrees Fahrenheit (F) is equal to the temperature T in degrees Celsius (C) times 9/5 plus 32:

T(F) = T(C) × 9/5 + 32

Example

Convert 20 degrees Celsius to degrees Fahrenheit:

T(F) = 20C × 9/5 + 32 = 68 F

Celsius to Kelvin conversion

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) = 20C + 273.15 = 293.15 K

Celsius to Rankine conversion

The temperature T in degrees Rankine (R) is equal to the temperature T in degrees Celsius (C) plus 273.15, times 9/5:

T(R) = (T(C) + 273.15) × 9/5

Example

Convert 20 degrees Celsius to degrees Rankine:

T(R) = (20C + 273.15) × 9/5 = 527.67 R

Celsius table

Celsius (C) Fahrenheit (F) Temperature
-273.15 C -459.67 F absolute zero temperature
0 C 32.0 F freezing/melting point of water
21 C 69.8 F room temperature
37 C 98.6 F average body temperature
100 C 212.0 F boiling point of water

 


See also

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