The Physics of Heat: Crash Course Physics #22

What is the difference between temperature and thermal energy?

• Temperature is the total energy, thermal energy is the average.

• Temperature is the average kinetic energy of individual molecules, while thermal energy is the total kinetic energy of all molecules.

• Thermal energy is measured in Celsius, temperature is measured in Joules.

• They are the same thing.

What is heat?

• A type of fluid that flows between systems.

• The energy transferred between systems when they are at different temperatures.

• The total kinetic energy of all molecules in a system.

• A measure of how well a substance stores energy.

What does "specific heat" tell us about a substance?

• How much mass the substance has.

• How quickly the substance melts.

• How well the substance stores heat.

• How much energy is needed to change its phase.

What happens to the temperature of ice when it is melting?

• It increases quickly.

• It stays the same until all the ice has melted.

• It decreases slowly.

• It changes to steam immediately.

How does heat move when you touch a hot metal spoon?

• Through electromagnetic waves.

• By warm air moving around.

• By molecules touching each other.

• By light energy.

What happens to warm water molecules in a kettle when heat is applied from the bottom?

• They stay at the bottom and get hotter.

• They move to the top and are replaced by cooler molecules.

• They turn into electromagnetic waves.

• They stop moving completely.

Which type of heat transfer does not need molecules to move or touch each other?

• Conduction

• Convection

• Radiation

• Absorption

Why do clothes help keep you warm?

• They make your body produce more heat.

• They stop all heat from leaving your body.

• They trap warm air close to your skin.

• They change heat into light.