12/11/24 convection, conduction and radiation

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when warmer, less dense areas of a fluid rise, while cooler, denser areas sink, creating a circulation pattern.

Front

What is conduction?

Back

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

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium to travel through, allowing heat to be transferred through empty space.

Front

How does convection affect weather patterns?

Back

Convection plays a crucial role in weather patterns by causing warm air to rise and cool air to sink, leading to the formation of clouds and precipitation.

Front

What is an example of conduction in everyday life?

Back

An example of conduction is when a metal spoon gets hot after being placed in a hot cup of coffee.

Front

What is an example of convection in action?

Back

An example of convection is the rising of warm air in a room heated by a radiator, causing a circulation of air.

Front

What is an example of radiation?

Back

An example of radiation is feeling warmth from the sun on your skin, even when you are not in direct contact with it.

Front

What happens to a liquid when it is heated?

Back

When a liquid is heated, it expands, becomes less dense, and rises, while cooler, denser liquid sinks, creating convection currents.

Front

How does a campfire warm nearby objects?

Back

A campfire warms nearby objects through radiation, as the heat is emitted in the form of infrared radiation.

Front

What is the role of density in convection?

Back

Density affects convection because warmer fluids are less dense and rise, while cooler fluids are denser and sink, creating a cycle.