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unit of measure: the base unit | the supplementary unit | the derived unit

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unit

Entropy

Definition

The entropy is the physical measure, which defines the system state function, expressed by the amount of heat transferred at a certain temperature system.

1 kelvin per joule is the entropy of the system, which at temperature change by 1 kelvin in an isothermal process, the amount of heat of 1 joule is transmitted.

 

system of units:   SI;
statute:   derived unit;
name the value:   S;
unit name:   joule per kelvin;
symbol unit:   J/K;
relationship of definition:   S = Q/T;
dimension:   L2 M T-2 Θ-1;
expression in other units:   cal/K, Btu/°F;

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Units of measurement

namesymbol value in SI unit:
J/K
note
1 BtuIT per degree fahrenheitBtuIT/0F≈ 1 899.101 
1 Btuth per degree fahrenheitBtuth/0F≈ 1 897.830 
1 BtuIT per degree rankineBtuIT/0R≈ 1 899.101 
1 Btuth per degree rankineBtuth/0R≈ 1 897.830 
1 calorieIT per degree celsiuscalIT/0C≈ 4 186.8 
1 calorieth per degree celsiuscalth/0C≈ 4 184 
1 calorieIT per degree kelvincalIT/K≈ 4 186.8 
1 calorieth per degree kelvincalth/K≈ 4 184 

Note:

(1) - Btu - British thermal unit;

(2) - IT - common unit, international;

(3) - th - thermochemical unit;