Arrows, Color and Captions

Visualization Exercise 4.3

Radiation

Zoom and Labels

Visualization Exercise 4.4

Water molecules in Solid, Liquid and Gas

Water molecules in Solid, Liquid and Gas

Notebook

• Answer the following questions:

1.What is radiant energy?

2.How does radiation affect the surface of Earth?

• Energy that passes through space

• Earth receives energy from the Sun

Main kind of energy from the Sun that heats the Earth

• Energy is transferred when:– light energy is absorbed by molecules in Earth’s surface

– causing them to move faster, which increases the temperature

Heat Transfer• Walking barefoot on a

hot day - – What did you feel?

– Why?

– How did heat transfer from the cement to your feet?

Challenge

• Heat cold water to about 30˚C without mixing the hot and cold water.

Using these materials and hot water

How would you set up the experiment?

Hot Water Setup

• Fill the vial with cold water

• A cup half full with hot salt water

• Observes what happens to the cold and hot water

The Results

How did heat transfer from the hot to cold water?

Were you able to raise the temperature of the cold water to 30˚C?

The Explanation• No cold, only

heat

• Cold is actually low levels of heat

Heat energy goes out of your hand into the ice cube

Heat

• Motion of atoms and molecules

• Greater motion = more heat energy

• Energy transfer happens between molecules or atoms when they come in contact

Faster moving molecules in the hand bump into the slower moving molecules in the ice

Molecules in hand slow down and we feel it as cold