Conduction, Convection, Radiation

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one through molecular collisions.

Front

What is convection?

Back

Convection is the transfer of thermal energy through the movement of fluids (liquids or gases). It occurs when warmer, less dense fluid rises and cooler, denser fluid sinks, creating a circulation pattern.

Front

What is radiation?

Back

Radiation is the transfer of thermal energy through electromagnetic waves. It does not require a medium (like air or water) to transfer heat, allowing it to occur in a vacuum.

Front

What is temperature?

Back

Temperature is a measure of the average kinetic energy of the particles in an object. It indicates how hot or cold an object is.

Front

How does heat transfer when boiling water on a stove?

Back

Heat is transferred through convection as the hot water at the bottom of the pot rises and cooler water descends.

Front

What happens to air near the ceiling of a room?

Back

The air near the ceiling is warmer because it rises due to convection, as warm air is less dense than cooler air.

Front

What is an example of conduction in everyday life?

Back

An example of conduction is a metal spoon heating up when placed in a bowl of hot soup.

Front

What is an example of convection in everyday life?

Back

An example of convection is the circulation of air in a room when a heater is turned on, causing warm air to rise and cool air to sink.

Front

What is an example of radiation in everyday life?

Back

An example of radiation is feeling the warmth of the sun on your skin, which is heat transferred through electromagnetic waves.

Front

What is the role of density in convection?

Back

Density plays a crucial role in convection; warmer fluids are less dense and rise, while cooler fluids are denser and sink, creating a convection current.