How can we boil water without heating it?

smhaq
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How can we boil water without heating it?
 
What is boiling? What does it mean when one says a liquid is "boiling"?
 
I remember a "Mr. Wizard" where they boiled water with an ice cube. First they boiled the water in a flask to get all of the air out and leave only water vapor. Then they corked the flask and took it off the flame. It stopped boiling. Then they rubbed it with an ice cube on the top of the flask and it quickly started boiling again.
 
Pressure play a part in determine the boiling pt of liquid.
Create a vacuum with water inside it, u will see the water boil.
 

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