Procedure

 

Make your own water

How to make water from thin air!

What you need:

  • a frozen can of soft drink
  • a classroom of air
  • a dry cloth

What you do:

  1. Take the frozen can out of the freezer.
  2. Dry the can with a dry cloth.
  3. Place the can on a table and watch as water forms on the outside of the can.

 

Explanation

 

Why does water form on the outside of a cold can of drink?

When you take a can of cold drink out of your fridge or freezer, you will notice that water begins to form on the outside of the can.

The water that forms on the outside of the can comes from the air. The air we breathe contains a number of gases. One of these gases is water vapour. When the air hits the outside of the cold can, the water vapour in the air quickly cools down and changes state. The water vapour (a gas) condenses to become water (a liquid).

Changing water vapour into water is reversible because once the can begins to warm up, the water on the outside of the can begins to evaporate. In other words, it turns back into water vapour.

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