Energy transfer by heating

Question 1

whats heat transferred by?

Answer 1

Heat can be transferred from place to place by conduction, convection and radiation. Dark matt surfaces are better at absorbing heat energy than light shiny surfaces. Heat energy can be lost from homes in many different ways and there are ways of reducing these heat losses.

Question 2

Infrared radiation

Answer 2

Infra-red radiation is a type of electromagnetic radiation, which involves waves rather than particles. This means that, unlike conduction and convection, radiation can even pass through the vacuum of space.

Question 3

Kinetic theory

Answer 3

The kinetic particle theory explains the properties of the different states of matter. The particles in solids, liquids and gases have different amounts of energy. They are arranged differently and move in different ways.

Question 4

what’s are the 3 particle arrangements?

Answer 4

solid
liquid
gas

Question 5

Conduction

Answer 5

Heat energy can move through a substance by conduction. Metals are good conductors of heat but non-metals and gases are usually poor conductors of heat. Poor conductors of heat are called insulators. Heat energy is conducted from the hot end of an object to the cold end.

Question 6

Convection

Answer 6

Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection.

Question 7

Evaporation and condensation

Answer 7

Evaporation and condensation are changes of state:

• evaporation involves a liquid changing to a gas
• condensation involves a gas changing to a liquid.