Many older thermometers contained mercury. A thermometer has two important elements: (1) a temperature sensor (e.g. The break in the column of mercury is visible. Source: quora.com. 1. Hence, the slightest change in temperature is notable when it's used in a thermometer. Alcohol was discovered as being great for this back in the 1700s. (Although it can measure temperatures much lower than mercury can). Excess heat often causes the tires to bloat in summers. The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. It has lower freezing point and higher boiling point. The levels constantly waver with even minor changes in temperature. BUT is mercury also used because the pressure of 760 mm of Hg is … A small change in the temperature causes change in volume of a liquid. In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. The other reason why mercury is used in thermometers is that it does not stick to the surface of the glass and has a shiny appearance. Mercury boils at 674ᵒF (78.37ᵒC). … Why is mercury used in thermometer ? How Did The Nintendo Game Duck Hunt Work? The thermometer should be housed in a casing to protect it from temperature fluctuations. Furthermore I know that it doesn't stick to the sides of the thermometer. They cannot be used to measure temperatures above this point. why is mercury used in the thermometers? What Is The Fibonacci Sequence? Why Does Your Smartphone Lose Charge, Even When You Don’t Use It? In addition to the answer and the comment given, the use of mercury in thermometers had another advantage frequently used in the lab: Mercury, as a metal, has a high electrical conductivity. Now, they stopped making thermometers with mercury … History . The advantages of using mercury in a thermometer are as follows: Mercury is a good conductor of heat. 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 . A lab might be required to be sealed for hours if a mercury thermometer breaks, considering that inhaling mercury can cause health serious problems. A mercury thermometer is a tool used to measure temperature. Even Galileo’s invention worked on the same principle. It is also cheap to acquire and very accurate at measuring high temperatures. But the mercury is linear temperature expansion can be observed. Mercury thermometers are designed utilizing the idea that mercury expands with heat. Why mercury is used in thermometer? Alcohol’s hypersensitivity can be compensated by its virtues. Dec 20,2020 - Why mercury is used in thermometer? One gram of mercury can contaminate a 20 acre lake, enough to cause a public advisory to be issued on the potential dangers of eating fish caught in that lake. ©Pxhere. Sol: There are many reasons for using mercury as a thermometric liquid, here are listed a few: Mercury has high melting and boiling points making it a liquid over a broad range of temperature. Kelvin thermometers are usually electric … Actually, we try to avoid it these days. ANS :- Mercury is the only one in liquid state at room temperature. Many countries are now moving to phase out the use of mercury thermometers. Mercury thermometers are being phased out as the metal is toxic if the thermometer breaks. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. One can also extend its freezing point by alloying it with thallium. Mercury has a higher coefficient of expansion than water, which means that changes in its volume with temperature are more noticeable. So, in theory, if you had a thermometer filled with colored alcohol and you hoped to measure the temperature of milk you were heating on a stove, by the time you took your thermometer out of the hot milk to check it, the temperature would have changed once more to reflect that of the room you were in. Hence, the slightest change in temperature is notable when it's used in a thermometer. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. 0 0. Mercury thermometers are being phased out in the US. Dec 20,2020 - Why mercury is used in thermometer? But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. Enamored with science ever since discovering a picture book about Saturn at the age of 7, he believes that what fundamentally fuels this passion is his curiosity and appetite for wonder. This material constant is called the coefficient of expansion. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? Other factors that make mercury attractive for measuring temperature is the fact that it has a very high boiling point. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. Glass thermometers can break and cause the person injury, and some contain mercury, which is poisonous; ones containing mercury, in particular, are no longer recommended. Mercury is available in pure form. Mercury is used in thermometers because. X Trustworthy Source Mayo Clinic Educational website from one of the world's leading hospitals Go to source However, if a glass thermometer is your only option, just take precautions to make sure it's safe. 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