Physics
The average kinetic energy of the molecules of an ideal gas is directly proportional to

Mass of Molecules
Absolute temperature of the gas
Temperature of environment
Velocity of Molecules

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large
The forces of adhesion are less

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