Among the options that correctly describes an ideal gas is a gas that obeys the gas laws under all conditions.
Ideal gas, also known as perfect gas, is a gas that physically complies with the ideal, or general, gas law, a particular idealised relationship between pressure, volume, and temperature. This law states that for a given amount of gas, the sum of the volume V and pressure P is proportional to the absolute temperature T; in equation form, PV = kT, where k is a constant. It is a generalisation that includes both Boyle's law and Charles's law as special cases. Such a relationship is known as a substance's equation of state, and it is sufficient to explain its basic behaviour. The kinetic theory of gases, which makes the assumptions, can be used to derive the ideal gas law.
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