In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. Mercury is the only one in liquid state at room temperature. The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. Mercury is used in thermometers eventhough its a bad conductor of heat due to its really high sensitivity towards heat,mercury expands significantly even for a small rise in temperature for which other metals show no or relatively smaller change . Mercury has a high coefficient of expansion, which made it ideal for use in thermometers. What Would Happen If You Shot A Bullet On A Train? Faster results for body temperature measurement. Graphene: The Material That’s Going To Change The Future. (Although it can measure temperatures much lower than mercury can). Mercury has a higher coefficient of expansion than water, which means that changes in its volume with temperature are more noticeable. When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. It expands on providing heat to it. Most metals are good conductors of heat and they are solids at room temperature. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. A thermometer has two important elements: (1) a temperature sensor (e.g. Mercury’s is about six times less that of alcohol. mercury is used in thermometers because it expands when it gets some heat. reshmasawnani reshmasawnani 14.05.2020 Science Secondary School Why is mercury used in thermometer ? the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared … Join now. mercury has a liquid form at room temperature and doesn't become a solid until it reaches -38 degrees Fahrenheit (-39 degrees Celsius). With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? The main reason why mercury thermometers are being phased out is because of how dangerous they are when broken. Imagine two thin wires inside the capillary of your thermometer. Hence, the slightest change in temperature is notable when it's used in a thermometer. Even Galileo’s invention worked on the same principle. Mercury was used in old thermometers because mercury expands when it reaches a certain temperature, so it was a really good "gauge". Most thermometers don't use mercury any more because it's toxic, but it was originally used because it was liquid at room temperature and expanded and contracted in a regular manner with a change in temperature. Hence our body temperature is observed by melting the liquid metal mercury due to our body temperature. When put under the armpit, the mercury in the clinical … | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. A small change in the temperature causes change in volume of a liquid. 1. Coupling these two properties, a thermometer is formed. The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. Many older thermometers contained mercury. 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