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. Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature. The reading would be effectively undisturbed, making the thermometer superiorly reliable. But the main disadvantage of the mercury thermometer is mercury… Close-up of a mercury-filled maximum thermometer. This material constant is called the coefficient of expansion. Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. Mercury in its liquid form has traditionally been used because of its fluid properties of separation and adherence through temperature extremes. What’s the Difference Between Virtual Reality And Augmented Reality? Why Are There Stones Alongside Railway Tracks? the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. Hence, the slightest change in temperature is notable when it's used in a thermometer… However, the amount of expansion per degree increase in temperature is different for every material. To avoid this unreliability, Dutch inventor Danie Fahrenheit replaced alcohol with mercury. It expands on providing heat to it. 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. 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. However, mercury is mildly toxic, and mercury has only been used in clinical thermometers if protected from breakage of the tube. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. So mercury level indicates the temperature as quickly as possible and accurately. In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. By confining the mercury to a container of known dimensions, one can determine the ambient temperature based on how much volume a … Mercury thermometers are designed utilizing the idea that mercury expands with heat. why is mercury used in the thermometers? You can use a thermometer to check if sugar is being melted or burned and if hot oil is ready for frying foods. Why is alcohol used in thermometers? Faster results for body temperature measurement. Share with your friends. 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. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. Thermometers containing a blue or red color liquid are most often utilizing an organic fluid, usually alcohol-based. How Big Is It and Does It Bite? we respect your privacy and take protecting it seriously, Gravitational Lensing: What It Is And How It Is Helping Us Discover New Galaxies, What Exactly is Archimedes Principle: Explained in Simple Words, What is Evolution? Old thermometers must be properly disposed of to prevent environmental contamination. A lab might be required to be sealed for hours if a mercury thermometer breaks, considering that inhaling mercury can cause health serious problems. Mercury thermometers will not be seen for much longer in people’s homes. Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). Coefficient Of Restitution: Definition, Explanation And Formula. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… Therefore, initially, thermometers defined temperatures. 1. Each thermometer contains about .5-1.5 grams of mercury. One could discern that the temperature is high when the material would radiate hues of blue and that the temperature is low when it would radiate hues of red. Alcohol expands rapidly when it heats up. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? Mercury is the only metal that is in liquid state at room temperature. When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. Mercury is the only one in liquid state at room temperature. The other wire is can move along a threaded rod. The levels constantly waver with even minor changes in temperature. Excess heat often causes the tires to bloat in summers. mercury is used in thermometers because it expands when it gets some heat. that how thermometers work, they have a little bit of liquid in them and it expands and goes up. And that reason is “Mercury has a high coefficient of thermal expansion”. How Did The Nintendo Game Duck Hunt Work? Dec 20,2020 - Why mercury is used in thermometer? 2. Mercury is used in a thermometer because it has a lot of advantages. 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. The substance expands and moves up the thermometer. Mercury thermometers cannot measure temperatures below this point. A small change in the temperature causes change in volume of a liquid. Mercury Thermometer. Mercury thermometers have long been considered the most accurate liquid-filed types. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. Similarly, water in a narrow tube rises or falls when its temperature rises or falls. Mercury thermometer: AD 1714-1742. Mercury’s is about six times less that of alcohol. The urge to develop a device that solely responded to heat led Joseph Delmedigo, a student of Galileo’s, to invent the first sealed liquid-in-glass thermometer. Hence, the slightest change in temperature is notable when it's used in a thermometer. When the temperature changes, the mercury expands and contracts, the temperature can then be read on the scale. Consequently, at first, thermometers portrayed temperatures. (Although it can measure temperatures much lower than mercury can). Why mercury is used in thermometer? When two bodies touch, their temperature adjusts, which means that the colder gets warmer, the warmer gets colder. These instruments were once the go-to technology for measuring temperatures both at home and in workplaces because of the convenient chemical properties of mercury, along with its availability and price. The thermometer should be housed in a casing to protect it from temperature fluctuations. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. Therefore, initially, thermometers defined temperatures. 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. Why mercury or alcohol is used in thermometers? Imagine two thin wires inside the capillary of your thermometer. Why is mercury used in thermometers despite being the poorest conductor of heat? Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. It's used because it expands well in heat. But the mercury is linear temperature expansion can be observed. Mercury is opaque and bright, so the movement of mercury inside the capillary tube is easily visible. History . Why is mercury used in thermometer ? That means Mercury expands or contracts with even a very small change in temperature. The other wire is can move along a threaded rod. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. Because of alcohol’s high coefficient of expansion, mercury was chosen as a better candidate for filling thermometers. Mercury is a highly toxic liquid; therefore, it should be handled with care especially if the thermometer is broken. By Victoria Simpson on May 21 2020 in Science. Actually, we try to avoid it these days. One can also extend its freezing point by alloying it with thallium. 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. Mercury is used in thermometers because it has high coefficient of expansion. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. Also, while alcohol can measure shockingly low temperatures, it is unable to measure temperatures greater than just 78.37ᵒC, alcohol’s boiling point. Because mercury is the only liquid metal and liquids expand more than solids on heating. It does not stick to the glass tube. Thermometers are a useful thing to have in your home. This is the working principle of every sealed, liquid-containing thermometer. It's used in thermometers because it has high coefficie… Each thermometer contains about .5-1.5 grams of mercury. Hence, the slightest change in temperature is notable when it's used in a thermometer. Kelvin thermometers are usually electric … 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 . Why are we using Mercury in thermometer, reasons are followed:. Mercury is used in thermometers because. One of them is fixed. ANS :- Mercury is the only one in liquid state at room temperature. Daniel Gabriel Fahrenheit used alcohol in thermometers in the 1700s. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. mercury has a liquid form at room temperature and ­doesn't become a solid until it reaches -38 degrees Fahrenheit (-39 degrees Celsius). On the other hand, alcohol poses no such threat. This is how every sealed thermometer with liquid works. Circle Of Willis: Anatomy, Diagram And Functions, Sheepshead Fish: Facts About The Fish With Human Teeth. It is a shining metal and when it expands, the expansion can be easily seen. This was the first thermometer because it was marked with a scale. The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a relatively long way up the tube. 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. On average, the temperature measurement should continue for at least 5-6 minutes, and for the most accurate measuring is required a weight of 10 minutes. A small volume of silver color mercury liquid is used inside the mercury thermometer. The inert gas increases the pressure on the liquid mercury, thereby increasing its boiling point even further. 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