The pressure of a gas is caused by the random impacts of gas molecules on surfaces that are in contact with the gas.
If the temperature of a gas in a sealed space increases the pressure of the gas increases because:
the molecules move faster, therefore they collide with more force
the number of impacts per second on the container increase
the total force of the impacts increases
The unpredictable motion of smoke particles is evidence of the random motion of gas molecules.
The random motion of tiny particles in a fluid is called Brownian Motion. Pollen grains on water, Brownian motion puzzled everyone until kinetic theory of matter provided an explanation.
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