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Get the shirts: bit.ly Facebook: facebook.com In today’s Scientific Tuesday episode we are going to crush cans using water! Why it works: When the water boils it pushes all the air out of the can. and if you quickly cool it it causes all the water vapor to condense which makes a vacuum inside of the can. That means the air pressure outside of the can is stronger than inside so the can collapses in on itself. Pretty cool.