Gases cannot form a free surface on their own.
However, gases do have a free surface at the boundary between gas and liquid, such as the free surface of the sea, or the boundary between the liquid of a soft drink and each carbon dioxide bubble rising in it.
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the movement of free moleculesof gases
Gases are highly compressible. So they don't have definite volume and pressure. As volume is reduced for a given mass pressure increases. Also as temperature changes then at constant volume pressure changes considerably. Same way for a constant pressure temperature change brings a change in the volume. Moreover gasses do not have a free surface.
The sun ray's are most responsible for Earth's surface temperature.
Solids: Atoms are not free to move about; they vibrate about their fixed positions Liquids: The particles are free to move about by sliding over each other Gases: The particles more about randomly at high speeds
The vaporization that takes place below the surface of liquid is called boiling. The other one that takes place at the surface of a liquid is called evaporation