A while back Heat Team A made thermometers. Following this the junior and senior elementary students made thermometers too. Dr Peff Puff gave them advice. The thermometers worked in that when they were placed in hot water the colour water that you can see went up the straw and when they were placed in cold water the coloured water went down in the straw. This is because liquids expand when heated and contract when cooled, so do gases and solids. This knowledge may be important in some way in our house designs.
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