Activity for 4.7

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? Radiation

4.             

Why can't conduction happen in a vacuum? There is no air, so there are no free moving electrons.

5.             

What happens to the space between the molecules in a gas when you heat it? Increases

6.             

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

7.             

Why can't convection happen in a solid? Solid is too bulk for currents to flow. The molecules are packed unlike liquid and gas where there is movement on molecules so there is current.