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The Hand Warmer Design Challenge

The Challenge

The ideal hand warmer increases in temperature by 20 °C (but no more) as quickly as possible, has a volume of about 50 mL, costs as little as possible to make, and uses chemicals that are as safe and environmentally friendly as possible. You will carry out an experiment to determine which substances, and in what amounts, to use in order to make a hand warmer that meets these criteria
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