HEAT TRANSFER THROUGH SOLIDS

You proceed at your own peril.

This is a disclaimer:

This experiment is to be done only UNDER THE SUPERVISION OF AN ADULT. Make sure that you have means to put out any fire that may accidentally result, by having a fire extinguisher and a bucket of water. Use a clothes pin to handle the hot metal strips, so you do not burn your hands.

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PROBLEM: To determine the rate of heat transfer for certain metals.

MATERIALS: Bic lighter, 2 clothes pins, candle wax, tacks, clock, strips of aluminum, stainless steel, iron, copper.

PROCEDURE & OBSERVATION:

1. Obtain one strip of metal, each strip should be about 2 cm wide and about 13 cm long; make a line mark at exactly 10 cm ,

2. Allow one drop of candle wax to drop on the 10 cm mark.

3. While the drop of wax is still warm ( liquid ) place a thumb tack on it, so that the tack will stick.

4.

QUESTIONS;

1. Burning gas is an example of what form of energy ?

2. The faster a molecule moves, the more ____________ it has.

3. Name three ways in which heat energy is transferred from place to place. Define each method.

4. Give an example of each method of heat transfer.

5. Which metal conducts heat the fastest ?

6. Which metal conducts heat the slowest ?

7. Which metal do you think would retain the heat energy the longest ? Why ?

8. Describe the physical properties of each metal strip .

9. Which metals are not attracted to the magnet ?

10. Explain how a vacuum bottle keeps liquids hot.

11. Explain why, when a radiometer is exposed to light, the black and white vanes inside, begins to turn.

12. For what, do you think, we can use metals that transfer heat at a fast rate ?

13. For what, do you think, we can use metals that transfer heat at a very slow rate ?

14. Define specific heat.

15. What are the units for specific heat ?

16. What is the specific heat for water ?

17. What is the specific heat for aluminum ?

18. What is the specific heat for iron ?

19. Find the number of calories required to raise the temperature of 30 grams of iron 10 ° C.

20. Find the number of calories required to raise the temperature of 50 grams of water 20 ° C.

21. Find the number of calories required to raise the temperature of 10 grams of aluminum 30 °C.