The thermally perfect gas obeys the equation of state p = ρRT. A calorically perfect gas has constant specific heats cp and cv. We speak about a “perfect” or “ideal gas”, if both is given. If a gas is thermally imperfect, it will also be calorically imperfect, and hence is a “real gas”.

: a gas in which there is no attraction between the molecules usually : a gas conforming exactly to the ideal-gas law.

Systems with either very low pressures or high temperatures enable real gases to be estimated as “ideal.” The low pressure of a system allows the gas particles to experience less intermolecular forces with other gas particles.

For a fixed number of moles of gas , a thermally perfect gas. is in thermodynamic equilibrium. is not chemically reacting. has internal energy , enthalpy , and constant volume / constant pressure heat capacities , that are solely functions of temperature and not of pressure or volume , i.e., , , , .

If the specific heat capacity is a constant value, the gas is said to be calorically perfect and if the specific heat capacity changes with temperature, the gas is said to be calorically imperfect. As the temperature increases, the vibration increases and more energy is associated with the vibration.

One mole of an ideal gas has a volume of 22.710947(13) litres at standard temperature and pressure (a temperature of 273.15 K and an absolute pressure of exactly 105 Pa) as defined by IUPAC since 1982.

Ideal gas: Ideal gas can be defined as a gas that obeys all gas laws at all conditions of pressure and temperature. Ideal gases do not condense. Ideal gas obeys all gas laws under all conditions of pressure and temperature.

perfect gas, also called ideal gas, a gas that conforms, in physical behaviour, to a particular, idealized relation between pressure, volume, and temperature called the general gas law.

Hydrogen

The conditions of an ideal gas is high temperature and low pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles’ kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.

There are three basic classes of ideal gas: the classical or Maxwell–Boltzmann ideal gas, the ideal quantum Bose gas, composed of bosons, and the ideal quantum Fermi gas, composed of fermions .

Perfect gas, a gas that conforms, in physical behaviour, to a particular, idealized relation between pressure, volume, and temperature called the general gas law. This law is a generalization containing both Boyle’s law and Charles’s law as special cases and states that for a specified quantity of