Basic units of thermodynamics

Basic units of thermodynamics

Mass——– kg.

Mole—— The mole is
the amount of substance that contains as many atoms (or molecules)

as there are atoms in 0.012 kg of carbon-12. Length—m.

Time: second

SI unit of temperature is Kelvin (abbreviated as K). The Kelvin is
defined as the fraction of 1/273.16 of the thermodynamic temperature of the
triple point of water. The relation between Kelvin and Celsius temperature is K
= C + 273.15 (The triple point of water is at 0.01 C).

Derived units: Force: 1 N = 1 kg m/s2, pressure 1 Pa = 1
2, 1 bar = 10 Pa, 1 atm. = 101325 Pa. 

In thermodynamics we are
concerned with absolute pressure.

 Gauge pressure = absolute pressure –
atmospheric pressure.

 Ordinary vacuum gauge pressure = atmospheric pressure –
absolute pressure.

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