Thermometer
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Thermometers are used to measure temperature and determine whether something is hot or cold. They allow comparisons to be made between different temperatures. A thermometer is needed to know which of two things is hotter.
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The document outlines steps for an experiment, including gathering information about sand and salt from various sources like the internet and books. It then has students observe samples of sand and salt and ask which is which. Finally, it has students make a hypothesis that the white powder (salt) will dissolve in water based on the information that salt dissolves in water unlike sand.
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Thermometer
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