Chap.10: Transfer of Heat energy and its effects

Question 1

What are the 3 different ways of transmitting heat?

Answer 1

1. Convection
2. Conduction
3. Radiation

Question 2

Define conduction

Answer 2

Conduction is the transfer of heat energy without the physical movement of the medium.

Question 3

How does conduction work?

Answer 3

Heat is added-> Molecules vibrate stronger-> Knocks neighbouring particles-> Heat is passed on

Question 4

Define convection

Answer 4

Convection is the transfer of heat from one place to another by the physical movement of a medium. The medium has to be a fluid

Question 5

Define radiation

Answer 5

It is the transfer of energy from a hotter body to a cooler body without the need for a medium

Question 6

Conduction of heat in solids is far better than in liquids and gases. Why?

Answer 6

In solids, particles are much closer to each other, therefore heat transfer quicker as they collide easier

Question 7

Why are metals better conductors of heat?

Answer 7

They contain free electrons; free to travel, spreading kinetic energy when they gain heat and vibrate