The parameters most important to a gas or air such as pressure, volume and temperature, determine the state of the gas at any particular time and are described as thermal state parameters.
The law of Boyle-Mariotte applies to ideal gases, i.e. at constant temperature the density (of a gas) behaves like the accompanying pressure p.
Formula 2.3.1
Gay-Lussac’s law tells us that at constant pressure the densities s of a gas behave in inverse proportion to the absolute temperatures T.
Formula 2.3.2
Formulae 2.3.1 and 2.3.2 enable us to form Boyle-Mariotte-Gay-Lussac’s law. If pressure and temperature of a gas change simultaneously, then the following applies taking into account the general gas laws:
Formula 2.3.3
If there is a change of state, individual state parameters assume different values. If pressure and temperature change simultaneously, then we deduce from the gas laws according to formula 2.3.3 and, leaving out the densities, that:
Formula 2.3.4
