Air Presure

Questions:
How can you crush a bottle with hot water?
Hypothesis:
With hot water and air.
Equipment:
Bottle
Hot water
Jug

Method:
1.Pour the hot water into the bottle.
2.Shake the bottle for 30 seconds.
3.Pour out the water and close the lid tightly.

Observation:
The bottle slowly crushes when we poured out the hot water and put the lid on tightly.

Result:
The bottle finally crushed after 1-2 minutes.

Explanation:
The hot water heated the air in the bottle.When the hot-water was poured out and the bottle closed tightly, the air began to less place then the same amount of warmer air, there was now more space in the bottle.To fill the extra space the sides of the bottle were pushed in by the force of the air pressure outside the bottle.