You will need the following items for this project: a spoon, newspaper, white vinegar, baking soda and a film canister with a pop-on lid. Spread the newspaper on a flat surface. Add a spoonful of baking soda to the film canister. Add vinegar to the canister until it is full. Quickly secure the lid on the canister, flip it upside down and place it on the newspaper. Stand back. The canister will shoot into the air and make a loud popping sound. This pressure and force are caused by the chemical reaction of the soda and vinegar.
This experiment requires the following items: a lemon, water, knife, scissors, balloon, rubber band and a mason jar. Use scissors to cut the neck off the balloon. Cut some of the peel away from the lemon. Cut a shape out of the lemon peel, such as a rocket or boat. Fill the jar with water. Place the peel in the jar. Stretch the balloon to cover the brim of the jar and secure it with a rubber band. Use your finger to press down on the balloon. The lemon peel will sink to the bottom of the jar. When your finger is removed, the peel will float back to the top. Pushing down on the balloon causes pressure. The pressure causes the air bubbles in the peel to be released, making the peel absorb more water and become heavier. The air bubbles return once the pressure is released.
You will need the following items for this project: a hard-boiled egg, clear glass bottle with a large neck and opening, and a match. Remove the shell from the egg. Light the match and toss it into the bottle. Immediately place the egg into the neck of the bottle. As the flame causes the air pressure inside the bottle to drop, the egg will be pulled down into the bottle. This reaction is caused by reverse air pressure.
Gather the following items for this experiment: string (5 feet long), two balloons, two drinking straws, sticky tape, scissors, paper cup and two chairs. Insert the string through the straws. Position the chairs 5 feet apart and tie the string to the back of the chairs so it is stretched tightly between them. Cut out the bottom of the paper cup and place it around the neck of one of the balloons. Inflate the balloon. Fold the neck of the balloon over the edge of the cup and hold it closed. Take the second balloon and insert its neck through the other end of the cup so it is in the opposite position of the first balloon. Inflate the balloon. The cup will fit snuggly once inflated. The pressure from the second balloon will bend the first one and cause it to retain air pressure. Tape the cup to the drinking straws. Let the cup go. The balloons will fly across the string as the pressure inside the balloons is released.