When air is heated, its volume will…, Heated, Hit, Cooled, Why are there gaps in railway tracks?, Why are there gaps in railway tracks?, To let water in, To prevent damage when heated, To make it look neat, Decrease, Stay the same, Increase, Which substance expands the most easily?, Solid, Liquid, Gas, When oil is heated, it will…, Shrink, Increase in volume, Disappear, A hot air balloon can rise because…, The air inside shrinks, The air inside expands, The balloon becomes heavier, Which of the following are examples of expansion?, When a bottle with a balloon is placed in hot water, the balloon expands because…, The air inside expands, Water enters the balloon, The bottle shrinks, Why is a metal bottle cap easier to open after being heated?, The cap expands, The bottle shrinks, Water enters the bottle, In which condition will the balloon be bigger?, Cold water, Hot water, The Same

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