In front of you is a bottle of air, a bottle of water and a spoon. The bottles may be made of any material you like and you may choose to have a lid on the bottle or not to have one.

1. How many ways can you describe to change the temperature of each of these substances ? You are allowed to use anything you can think of. Please describe how each process might work. (If the student says 'heat it' ask them how they would heat it.)

a. Air

b. Water

c. Metal spoon

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