Thinking: Can you deflate plastic bottles without hands?
Ingredients: 2 cups, 1 cup of warm water, 1 bottle of mineral water.
Operation:
1. Put warm water in the bottle and touch the bottle with your hand to see if it feels hot.
2. Pour the warm water out of the bottle again and quickly cover the bottle cap.
3. Watch the bottle deflate slowly.
Explanation:
1. Heat the air in the bottle to reduce its pressure.
2. Because the air pressure outside the bottle is greater than the air pressure inside the bottle, the bottle is crushed.
Create:
What will the bottle look like if the pressure of the gas in the bottle is greater than the pressure of the air outside the bottle?
Table tennis capable of long jump.
Thinking: Ping-pong is put in a goblet. How to blow to make the ball jump out of the goblet?
Materials: 2 goblets, table tennis 1 piece.
Operation:
1 Place two goblets side by side.
Put the ping-pong ball in the first cup.
Blow from different angles to see what table tennis is like: blow on the side of the ball; Blow into the ball.
Explanation:
1. Blow the air to the side of the ball, so that it is not easy for table tennis to jump into the second cup (or jump out).
2. Blow on the top of the ball, the pressure on the top will be reduced, and the table tennis will float. Keep blowing and jump to the second cup.
Creation: A new method can also make table tennis jump into the next cup.
A bottle that blows bubbles.
Thinking: Do you know how bottles blow bubbles?
Materials: 1 beverage bottle, 1 cup of hot and cold water, one cup of colored water, 1 large plate, 1 piece of plasticine, and several straws.
Operation:
1 Connect the straws one by one to form a long tube (the connection port is sealed with adhesive tape).
Put the straw in the bottle, seal the bottle with plasticine, and then put the bottle on the plate.
3 Bend the straw so that the other end of the straw enters the glass filled with colored water.
Pour hot water on the bottle wall, and the straw in the cup will emit many bubbles.
Pour cold water on the bottle wall.
The water in the cup will flow into the bottle through the straw.
Explanation:
1 Because the plastic bottle is very thin, heat can enter the air inside the bottle through the bottle wall.
The air in the bottle will expand when heated.
Bubbles in water are air squeezed out of a bottle when air expands.
The air in the bottle contracts when it is cold.
When the air in the bottle contracts, water occupies the remaining space.
Creation: Do you know the best way to open the bottle cap when it is too tight?