Hot water makes the top off a closed bottle (or
something like that) "pop" faster than cold water.
As water gets heated, the molecules started moving
faster and collide with each other more. They are
moving from a liquid state (water) to a gas state
(water vapor). As they collide, the pressure
increases in the bottle. Soon, the pressure in the
bottle, due to the collision forces of the
molecules, is too great for the bottle to handle
and the bottle top will pop off faster. Water at,
let's say, 300 degrees Fahrenheit will cause the
bottle to pop faster, and further, and if the
water was 150 degrees even though water will be
past boiling temperature in both bottles. When you
have cold water, the molecules are not moving as
fast and do not build that excess pressure.
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