According to the kinetic-molecular theory, particles of matter

According to the kinetic-molecular theory, which substances are made of particles?

If a substance is cooled, what happens to its particles?

What is expansion?

What is contraction?

A substance is heated up and then allowed to cool down. What happens to the particles during this time period?

Many objects, such as train tracks and road joints, are specifically designed to allow extra space for

The liquid in a thermometer rises when it is placed in the hot water because

When objects contract upon cooling

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the particles:

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