Heat Transfer

Question 1

Conduction

Answer 1

Metals are good conductors due to free electrons. Kinetic energy increases in the atoms. This means they are moving around more and will move through to another metal.

Question 2

Convection

Answer 2

Convection occurs in liquids and fluids, when the fluid is heated the particles begin to move around and spread further apart. This results in the fluid becoming less dense and the heat in there water can rise , resulting in a convection current.

Question 3

Infra-Red

Answer 3

When a particle gains kinetic energy it emits infra red to cool down. If an object is hotter than its surrounding then it will emit more infra red than it absorbs. If it is cool then it will happen the opposite way around.

Question 4

Evaporation

Answer 4

When the surface of a liquid gains enough Kinetic energy then they are able to break the bonds with the molecules, the remaining particles average kinetic energy decreases and this results in a drop in temperature

Question 5

Rate of Heat Transfer

Answer 5

initial rate of cooling = temperature change/time taken