An imaginary gas whose properties are similar to the properties of a real gas (a gas whose molecules occupy space and interact with each other) at infinitely low pressure. This imaginary gas is called 'perfect gas' or ideal gas'.According to the definition, the following properties are imagined in a perfect gas :
Concept of Perfect Gas
Concept of Perfect (ideal) Gas:
(1) It strictly obeys Boyle's law, Charles' law, and the law of pressure under all conditions of
temperature and pressure.
(2) Its pressure coefficient and volume coefficient are exactly equal to each other.
(2) Its molecules are infinitesimally small.
(3) There is no force of attraction between its molecules. Obviously, a perfect gas cannot be converted
into a liquid or solid state, because a force of attraction is necessary between the molecules in the
liquid or the solid state.
In practice, the gases that are difficult to liquefy, such as oxygen, nitrogen, hydrogen, and helium
can be considered as perfect, although these are also not ideally perfect.
