Materials Required:
l Glass soda bottle
l Water
l Drinking glass
Procedure:
- Fill a glass soda bottle to the rim with water. Hold a clear drinking glass upside down and place it over the mouth of the bottle.
- Holding both the glass and the bottle together, turn them upside down at the same time. Some water may escape into the glass.
- Raise the bottle 2 inches from the bottom of the glass and keep it in this position. You will see the water come from the bottle and go into the glass, but the water will stop as soon as it reaches the level of the bottle’s mouth.
- Repeat Step 3, raising the bottle 2 inches more. The water will never rise beyond the bottle. Can you explain why?
This Is What Happens:
When you raise the bottle, air blows into it, pushing the water out of it. When the water level in the glass reaches the bottle mouth, the air outside the bottle presses on the water in the glass and prevents any more water from leaving the bottle.
