1. Heat Transfer

2. Investigation 4- Heat Transfer Enduring Understanding: The movement of heat energy in and out of the atmosphere is an important element of weather. Learning Goals: I will measure the heating and cooling of earth materials when moved into and out of sunshine. I will explain how radiant energy from the Sun heats up solid and liquid materials. I will use thermometers to measure the temperature of materials. I will design and conduct experiments to observe heat transfer through multiple materials in terms of molecular activity. I will describe how the atmosphere I heated.

3. Quick Write What is radiant energy? How does radiation affect the surface of Earth?

4. Radiation Review Visible light is the main kind of energy from the Sun that heats Earth. Energy is transferred when light energy is absorbed by molecules in Earth’s surface, causing them to move faster, which increases the temperature.

5. Energy Transfer Challenge cold hot I need some warm water, but the water I have here is too cold. I thought I would mix it this hot water, but the hot water has salt (red food coloring) in it. cold How can I warm up this cold water without mixing them together? (Question!)

6. Energy Transfer Challenge Materials Cold Cold Water Hot Hot “salt water” One Plastic Cup One Vial Two Thermometers

7. Energy Transfer Challenge

9. Were you able to raise the temperature of a sample of water? How were you able to do that? How did heat transfer from the hot water to the cold water?

10. Conduction COLD THERE IS NO COLD, only heat. (Sort of) When you hold an ice cube, you are transferring heat from your hand to the ice cube. Heatatomsmolecules greatermore Heat is motion of atoms and molecules. The greater the motion, the more heat energy there is in a solid, liquid, or gas.

11. Conduction hot heat cold When material 1 (hot salt water) with lots of heat, or molecular motion, comes in contact with material 2 (cold water) which has less molecular motion, the molecules from material 1 bang into the molecules in material 2 and get them moving faster.

12. Conduction heat As a result, molecules in material 2 now have increased molecular motion (heat) so material 2 is now hotter. coldwarm our cold water is now warm! heat Also, the molecules in material 1 have less motion (heat) so material 1 is now cooler hotwarm our hot water is now warm too!

13. Conduction Energy transfer happens between molecules or atoms when they come in contact. conduction conduction This kind of heat transfer is conduction. Heat can transfer by conduction from atom to atom in a material, or between two different materials when their atoms or molecules make contact.

14. Heat and Energy Animation (again)

16. Word Bank Radiation Radiation - energy that is radiated or transmitted in the form of rays or waves (marshmallow and flame) Conduction Conduction - energy transfer by contact (pancakes or feet)