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1.             What is the most common heat transfer mechanism in solids?

Conduction

2.             What is the most common heat transfer mechanism in liquids and gases?

Convection

3.             What is the only heat transfer mechanism in a vacuum?

(Infra-red) Radiation

4.             Why can't conduction happen in a vacuum?

There are no particles in a vacuum to transfer the vibrations

5.             What happens to the space between the particles in a gas when you heat it?

The space between the particles increases

6.             What happens to the density of a gas when you heat it?

It decreases because thespace between the particles increases

7.             Why can't convection happen in a solid?

In a solid the particles are fixed in position and are not free to move