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The pressure of the water gas inside the bubble must be just
greater than the air pressure, so there must be enough
water particles with enough energy to give
a bubble with enough pressure: this normally
happens when the temperature is 100°C.
If the air pressure is reduced bubbles with a lower pressure
can form, so water can boil at temperatures below 100°C.
At very low pressures, water can boil close to 0°C!
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