![]() ![]() Step 3: Tell a friend you’ll pay them one million dollars if they can blow the ball into the bottle.ĭon’t worry about losing money-because this is impossible. Step 2: Roll a piece of paper towel into a small ball about half the size of the bottle opening. Step 1: Place an empty water or soda bottle down horizontally on a table. Because the air pressure is higher above the ball than below it, it’s pushed down into the funnel-no matter how hard you blow or in which direction you point the funnel. This is because as you blow into the funnel, the air moves faster and lowers the air pressure underneath the ball. Step 3: You’ll notice that the ball doesn’t pop out of the funnel-but why? Step 2: Blow hard into the narrow end of the funnel. Step 1: Put a ping-pong ball inside the wide part of a funnel. This higher pressure pushes on the water, forcing it up and out of the straw. When you blow into the straw, you’re increasing the air pressure inside the sealed bottle. Step 4: Blow hard into the straw-then stand back. Step 3: Wrap a lump of clay around the straw to form a seal. Step 2: Take a long straw and insert it into the mouth of the bottle. Step 1: Fill a 2-liter soda bottle half full of water. ![]() This is due to about 15 pounds of force from the air pushing up, while the force of the water pushing down is only about one pound of force. Voilà! Because the water inside the cup is lighter than the air outside, the card is held in place. Step 4: Remove your hand from underneath. Step 3: Holding the card in place, take the cup to the sink and turn it upside down. Step 2: Cover the entire mouth of the cup with an index card. Interested in testing out these principles in a more tangible way? Try one or more of the following experiments: Water Glass Trick When a plane moves along the runway, the air above the wing speeds up, lowering the pressure so that the air below the wing can push the plane upward. Imagine that fast-moving air particles are in so much of a hurry that they don’t have time to apply force-this is the principle used to make airplanes fly. Similarly, when an air particle speeds up, it actually “pushes” less. Wherever the air pressure is higher, there will be a stronger force or push against an object. The ordinary pressure of the air surrounding us is 14.7 pounds per square inch-but this can change based on a few factors, such as when the wind blows or a car or airplane accelerates. Even the simplest experiments have the potential to go wrong. Note: when conducting at-home science experiments with children, an adult should always be present.
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