Unit 3: Thermal Energy Transfer

Front

What is convection in the context of thermal energy transfer?

Back

Convection is the process of heat transfer through the movement of fluids (liquids or gases) where warm air or liquid rises and cool air or liquid sinks.

Front

How does the motion of particles relate to temperature?

Back

The greater the motion of particles in a substance, the higher the substance’s temperature.

Front

What happens to the temperature of water when an ice cube at 0°C is added to it?

Back

The temperature of the water in the glass just after the ice cube melts will be between 0°C and 28°C.

Front

What is an example of convection in everyday life?

Back

An example of convection is the movement of warm air rising and cool air sinking, such as in a room heated by a radiator.

Front

From where to where does thermal energy always move?

Back

Thermal energy always moves from warm objects to cool objects.

Front

What is thermal equilibrium?

Back

Thermal equilibrium is the state in which two objects in contact with each other reach the same temperature and no heat flows between them.

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials, where heat moves from the hotter object to the cooler one.

Front

What is radiation in terms of thermal energy transfer?

Back

Radiation is the transfer of thermal energy through electromagnetic waves, which can occur in a vacuum.

Front

What factors affect the rate of convection?

Back

The rate of convection is affected by the temperature difference between the fluid and its surroundings, the properties of the fluid, and the surface area of the heat source.

Front

What is the role of density in convection currents?

Back

In convection currents, warmer, less dense fluid rises while cooler, denser fluid sinks, creating a cycle of movement.