Weather Projects for Young Scientists: Experiments and Science Fair Ideas

Weather Projects for Young Scientists: Experiments and Science Fair Ideas — page 9
take up space The weight of the air pushes on the earth's surface just like a stack of blankets pushes down on a table This pushing force is called air pres sure At sea level air pressure is about 14 7 pounds per square inch 1 kg cm2 Air pressure lessens with height however halving about every 3 4 miles 5 5 km There's less air pressure on top of a mountain than at sea level We re literally living at the bottom of an ocean of air Air Is Everywhere Air may be made up of invisible gases but it takes up space Prove to yourself that air has volume in this activity You'll Need water funnel with a very narrow tip small clear plastic bottle such as a salad dress ing bottle sharpened pencil modeling clay 1 Set the funnel inside the neck of the bottle Think about what's filling up the inside of the empty bottle 2 Pour water through the funnel until the bottle is halfway filled Is there still air in the bottle What