Temperature standard

In 1967, the International Metrology Congress, the International Metrology Committee decided in 1968 that the new humidity standards are as follows:

the amount

symbol

unit

symbol

Note

Thermodynamic temperature

T

Kelvin

K

1 Kelvin is equal to 1/273.15 of the thermodynamic temperature of the triple point of water, and Kelvin is one of the basic units of the International System of Units.

Celsius

t

Celsius

oC

t=T-T0, T0=273.15K,


1 degree Celsius = 1 Kelvin

International Practical Kelvin Temperature

T68

Kelvin

K

These two temperatures can be measured using the 1968 international practical temperature scale. T68 and t68

It is the best approximation of T and t. The relationship between the two is:
T68=T 68-T0


T0=273.15K

International practical Celsius temperature

T68

Celsius

oC

The temperature difference is expressed in Kelvin and can be expressed in degrees Celsius.

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