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Water would theoretically work in a thermometer provided you were only interested in temperatures in water's liquid range. However:
Temperatures below the freezing point of water are not at all uncommon in many populated areas; and
Water has high surface tension and wets glass fairly well, so you might get droplets of water sticking to the sides of the tube.
Water will also start to expand after 4oC and below, which means the thermometer would say it's getting warmer when it's actually getting colder.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoWater cannot be used as the liquid inside a thermometer because of its physical properties. When water freezes, it turns to ice and expands. Fresh water has a maximum density at around four degrees Celsius and if the water is a cooler temperature than four degrees Celsius, i will not register. Water is the only liquid on earth that reaches its maximum density without solidifying. (Freezing point of water is zero degrees Celsius)
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