Do gases (air, carbon dioxide, nitrogen, oxygen, etc.) expand when heated?
They expand, and to an even greater extent than solids and liquids. The coefficient of volumetric expansion for all gases at constant pressure is the same and equals 1/273. That is, when any gas is heated by 1°C under constant pressure, the volume of a given mass of gas will increase by 1/273 of the volume it occupied at 0°C.
