Heat Transfer

Front

What is heat transfer?

Back

Heat transfer is the movement of thermal energy from one object or substance to another due to a temperature difference.

Front

What are the three main modes of heat transfer?

Back

The three main modes of heat transfer are conduction, convection, and radiation.

Front

Define conduction in the context of heat transfer.

Back

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

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases) caused by differences in temperature and density.

Front

Explain radiation as a mode of heat transfer.

Back

Radiation is the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum and does not require a medium.

Front

Give an example of conduction in everyday life.

Back

An example of conduction is an egg cooking in a frying pan, where heat is transferred from the pan to the egg.

Front

What happens to warm air in a room?

Back

Warm air rises because it is less dense than cooler air, leading to convection currents.

Front

How does a thermos bottle minimize heat transfer?

Back

A thermos bottle minimizes heat transfer by using insulation, which reduces conduction, convection, and radiation.

Front

What is the role of insulation in heat transfer?

Back

Insulation slows down the transfer of heat, keeping hot things hot and cold things cold by reducing conduction and convection.

Front

Describe a real-world application of convection.

Back

A real-world application of convection is the heating of water in a pot on a stove, where hot water rises and cooler water sinks.