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Program No. 2 ZERO Things to Do t 1. Melt ice, then boil water until steam is formed. There are three states of matter: solid, liquid, and gas. What does heat do? 2. Use a thermometer to determine boiling and freezing points of water. 3. Keep a daily record of thermometer readings and changes in weather. Sources : 1. Parker - ’’Thermometers, Heat, and Cold” 2. Parker - ”Ask the Weatherman” 3. Carroll - Understanding cur World 4. Carroll - Understanding the Universe Program No. 3 TORRICELLI Things to Remember : 1. Air exerts pressure. 2. Air pressure changes slightly from day to day. 3. A barometer measures air pressure. Air is a substance which occupies space and exerts pressure. At sea level the average pressure is about 15 pounds per square inch. A barometer, an instrument invented by Torricelli, measures the pressure of the atmosphere. Changes in atmospheric pressure accompany or go before changes in weather. A rapidly falling barometer often indicates an approaching storm; a rising barometer may indicate fair weather. Winds are caused by the flowing of air from regions of' high pressure to regions of low pressure. Things to Do : 1. Use a tumbler of water and a piece of paper, inverted, to show that air exerts pressure in holding the paper against the glass. 2. Keep a record of daily barometer readings and note weather changes that follow pressure changes. Sources : 1. Parker - ”Ask the Weatherman” 2. Fletcher - Earth Science 3. Carroll - Understanding our World ■ 4. Carroll - Understanding the Universe -4-