Materials: saucepan filled with hot water, oven mitts or gloves, empty glass bottle (such as a ketchup bottle), rock or a weight to hold the bottle down, balloon
Put a balloon over the top of an empty ketchup bottle (you may need to put a rock in the bottom of the bottle for weight). Place the bottle in a saucepan of hot water. The balloon should expand because the air inside the bottle gains thermal energy and the molecules move around more, filling the space inside the balloon.
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