A cup contains hot liquid. Some of the liquid evaporates. What happens to the mass and what happens to the weight of the liquid in the cup?
mass: decrease, weight: decrease.
A gas is stored in a sealed container of constant volume. The temperature of the gas increases. This causes the pressure of the gas to increase. What happens to the kinetic energy of the gas molecules during this pressure increase?
The average kinetic energy of the molecules increases.
Small smoke particles suspended in air are viewed through a microscope. The smoke particles move randomly. What does this show?
The air consists of fast-moving molecules.
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