What does the temperature of a substance directly measure?

The total number of particles in the substance

The average kinetic energy of the particles in the substance

The specific speed of a single, individual particle

The potential energy stored within the chemical bonds of the particles

A student has two identical glasses of water. Glass A is at 80°C and Glass B is at 20°C. How does the motion of water molecules in Glass A compare to Glass B?

The molecules in Glass A are, on average, moving more slowly than in Glass B.

The molecules in both glasses are moving at the exact same average speed.

The molecules in Glass A are, on average, moving more rapidly than in Glass B.

The molecules in Glass A have stopped moving, while the molecules in Glass B are moving slowly.

Their average kinetic energy is increasing.

Their average kinetic energy is decreasing.

They are changing into a different type of molecule.

They are getting larger in size.

Because temperature indicates the exact direction each molecule is traveling.

Because temperature provides a measure of the average speed of molecular motion.

Because temperature only works for substances that are moving, like a car.

Because a thermometer's needle looks and functions exactly like a car's speedometer.