Copy and complete the table. Write conduction, convection or radiation in the spaces in the first column.
Warm fluid moves, carrying energy with it.
Energy travels as infrared waves.
Energy travels through a material without the material moving.
Important Questions on Thermal (Heat) Energy Transfers
Which thermal energy is conducted through a metal. Write a brief description of each of them.
How energy is passed from one particle to the next.
Which thermal energy is conducted through a metal. Write a brief description of each of them.
How energy is transferred by electrons.
Copy this description of convection, choosing the correct word from each pair.
When a fluid is heated, it expands / contracts. Because its volume is greater / less, its density is greater / less. It is thus heavier / lighter than the surrounding fluid, and so it rises / sinks. Colder fluid is more / less dense and so density / gravity pulls it downwards. It replaces the hotter fluid. In this way, a conduction / convection current starts to flow.
Copy and complete the table. Use words from the list to describe materials that are good at absorbing, emitting and reflecting radiation. You will have to use some words more than once.
Shiny, black, white, Matt
| Good absorber | Good emitter | Good reflector |
In cold climates, it is important to keep a house well insulated. Listed below are three ways of insulating a house. For each, explain how it reduces heat loss. In your answers, refer to conduction, convection or radiation, as appropriate.
Heavy curtains, when closed, trap air next to a window.
In cold climates, it is important to keep a house well insulated. Listed below is a way of insulating a house. For each, explain how it reduces heat loss. In your answers, refer to conduction, convection or radiation, as appropriate.
Shiny metal foil is fitted in the loft, covering the inside of the roof.
In cold climates, it is important to keep a house well insulated. Listed below are three ways of insulating a house. For each, explain how it reduces heat loss. In your answers, refer to conduction, convection or radiation, as appropriate.
Glass wool is used to fill the gap in the cavity walls.
The diagram shows a way of demonstrating a convection current in air.
Explain why air rises above the hot flame.
