Heat Transfer Review Marshmallow and flame Pancakes and

Heat Transfer

Review Marshmallow and flame Pancakes and feet What am I talking about when I use these words?

Radiation • Energy comes from the Sun as radiant energy. Radiant energy travels as waves through space and through air. Radiation from the Sun can be visible, like light, or invisible, like infrared radiation, ultraviolet radiation, X-Ray, or radio wavelengths.

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

Bonus (this MAY appear tomorrow) • What is heat? – Molecular Motion is heat! The faster atoms or molecules move, the more heat energy they produce.

• Sarah and Robert wanted to know if dry soil or water heats up faster in the sunlight. They measured equal amounts of dry soil and water into two separate containers that were the same shape and size. Then they got ready to take the containers outside.

What should they do to gather data? After 20 minutes in the sun, which material will be hotter? Why or why not?

• Sarah and Robert also wanted to know if a metal spoon will become hot when it is sitting in hot soup. They heated up some water, and then put a spoon in it.

What should they do to gather data? Will the spoon become hot? Why or why not? After 20 minutes in the sun, which material will be hotter? Why or why not?

Derek and Whitney took the temperature at 8: 00 am. It was 12 degrees C. Every hour they rechecked the temperature. Make a graph of the temperature change.

What should they do to gather data? After 20 minutes in the sun, which material will be hotter? Why or why not? HOURS Will the spoon become hot? Why or why not? 0 1 2 3 4 TEMP. 12°C 13 °C 15 °C 17 ° C 21 °C

Computer Activities • Visit the FOSS Site (Middle School) • You may work on any of the activities under Matter And Energy