Mercury thermometer: AD 1714-1742. Coupling these two properties, a thermometer is formed. It consists of a bulb containing mercury attached to a glass tube of narrow diameter; the volume of mercury in the tube is much less than the volume in the bulb. Furthermore I know that it doesn't stick to the sides of the thermometer. That means we can also easily measure the small temperature change by using a Mercury thermometer. reshmasawnani reshmasawnani 14.05.2020 Science Secondary School Why is mercury used in thermometer ? It is a shining metal and when it expands, the expansion can be easily seen. … These new mercury-thallium thermometers can now measure temperatures as low as -62ᵒC. Mercury thermometers are designed utilizing the idea that mercury expands with heat. Question 6. Mercury powers itself, making it an attractive substance. Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature. How Do Aircraft Find Submarines In Deep Water? The increase in volume is evident in solids, such as metallic railway tracks, rubber tires and fluids like water, alcohol, mercury and halogen. Your grandparents may have one in their medicine cabinet, or even your parents, but newly stocked bathrooms are much more likely to have a digital thermometer on hand. 1. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. mercury doesn't boil until 611 degrees Fahrenheit (357 degrees Celsius), and it doesn't stick to glass. The boiling point of mercury is nearly 674.06 degree Fahrenheit so using it in college laboratory really doesn't converts the mercury to vapour it's non sticky.the property of mercury to not stick on glass is main reason to use it unlike water, droplets of mercury never stick on the glass walls of the thermometer. History . Why Are There Stones Along Railway Tracks? Ask your question. Mercury thermometers are being phased out as the metal is toxic if the thermometer breaks. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. Mercury thermometers have long been considered the most accurate liquid-filed types. In addition, mercury is the only metal that is a liquid at room temperature, making it an attractive candidate. It's used in thermometers because it has high coefficient of expansion. Share 0. mercury is a good condutor of heat. Join now. Graphene: The Material That’s Going To Change The Future. Why mercury is used as a thermometric fluid ? Get the answers you need, now! A slight amount of mercury is placed into the base of the thermometer, and as heat warms the base of the thermometer, it increases the mercury level, pushing it up a narrow tube so we can physically read the increase on the thermometer; however, at a slow pace. Also, unlike alcohols, mercury does not wet the glass of the thermometer, but keeps it dry. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. Do you know the reason behind usage of mercury in thermometer? And because of this reason we use mercury in thermometers. Even Galileo’s invention worked on the same principle. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. Why is mercury used in thermometers despite being the poorest conductor of heat? Held within a bulb at the base of the instrument, mercury is free to move up and down a capillary tube where its position can be associated with a specific temperature. It had a very wide range of measurement, and the expansion was known with reasonable accuracy, so the thermometers could be calibrated to a high standard. Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. Now, they stopped making thermometers with mercury … Why Are There Stones Alongside Railway Tracks? Mercury is used in a thermometer because it has a lot of advantages. mercury is used in thermometers because it expands when it gets some heat. Mercury thermometers are being phased out in the US. When two bodies touch, their temperature adjusts, which means that the colder gets warmer, the warmer gets colder. 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. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Why mercury is used as a thermometric fluid ? Why Is Mercury Used In Thermometers? Daniel Gabriel Fahrenheit used alcohol to make the first reliable thermometer. One of them is fixed. What Is The Fibonacci Sequence? Alcohol’s hypersensitivity can be compensated by its virtues. How Did The Nintendo Game Duck Hunt Work? Compare that meager boiling point to mercury’s incredible 356.7ᵒC boiling point! Mercury is a highly toxic liquid; therefore, it should be handled with care especially if the thermometer is broken. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… hope this is correct. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. The invention of the first thermometer is credited to Hero of Alexandria, a curious engineer who is considered the greatest experimenter of antiquity. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. It's used because it expands well in heat. However, alcohol is so sensitive that these changes cause the alcohol in the tube to behave almost turbulently. 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. They will be replaced with newer technology such as digital devices, but they will be missed. However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. But the main disadvantage of the mercury thermometer is mercury… However, mercury is mildly toxic, and mercury has only been used in clinical thermometers if protected from breakage of the tube. Mercury has a boiling point which makes it suitable to measure higher temperatures. By Victoria Simpson on May 21 2020 in Science. Mercury is opaque and bright, so the movement of mercury inside the capillary tube is easily visible. The scale, which was slightly altered at a later date, now bears his name. 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