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With a few exceptions (notably melting ice) objects expand when heated. If you run hot water on a bottle neck, the heat is applied directly to the bottle and only indirectly to the stopper inside the bottle, so the bottle heats first, and thereby expands sooner than the stopper does. An expanded bottle will exert less pressure on the stopper.
you increase the pressure
They begin to move quicker
if the sky is blue, the answer is yes
When you suck air from a bottle you create a partial vacuum and there is less air pressure in the bottle; but outside there is atmospheric pressure so it tends to collapse the bottle.
If the stopper has an airtight seal, the pressure in the bottle will increase, with the same amount of air and water confined to a smaller area.
The pressure will slightly increase.
With a few exceptions (notably melting ice) objects expand when heated. If you run hot water on a bottle neck, the heat is applied directly to the bottle and only indirectly to the stopper inside the bottle, so the bottle heats first, and thereby expands sooner than the stopper does. An expanded bottle will exert less pressure on the stopper.
Decanter
A CORK stopper is a plug for a bottle made of cork
The 'operator' fills the bottle with water, then pumps air into it - creating pressure. When the stopper is released, the air pressure forces the water out of the narrow opening in the bottle's neck - creating a stream powerful enough to launch the rocket into the air.