1. Mercury powers itself, making it an attractive substance. Close-up of a mercury-filled maximum thermometer. The inert gas increases the pressure on the liquid mercury, thereby increasing its boiling point even further. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. Why are we using Mercury in thermometer, reasons are followed:. Here you will come to know the reason why alcohol is used in Thermometers. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. It has lower freezing point and higher boiling point. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. But the main disadvantage of the mercury thermometer is mercury… However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. Mercury and its compounds have the ability to cause severe neurological problems and other serious symptoms in humans when they are exposed to it. Why mercury is used as a thermometric fluid ? Also, while alcohol can measure shockingly low temperatures, it is unable to measure temperatures greater than just 78.37ᵒC, alcohol’s boiling point. You can then look at your thermometer, and you will have enough time to read the temperature it displays before the mercury goes back down again. However, mercury is mildly toxic, and mercury has only been used in clinical thermometers if protected from breakage of the tube. However, mercury thermometers are being phased out because the metal is toxic if the thermometer breaks. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Share 0. mercury is a good condutor of heat. Mercury also has a high coefficient of expansion, but it is not too high. Lastly, you do not need an external power source like a battery or electricity to run a mercury thermometer. 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. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. The thermometer should be housed in a casing to protect it from temperature fluctuations. While nothing can be done about mercury’s rarity, expensiveness and toxicity, one can still overcome its thermal limitations. Materials, when under constant pressure, expand when subjected to heat because the heat elevates the kinetic energy of its atoms, causing them to violently move and therefore separate from each other. This means that mercury in a sealed tube would rise at a much slower pace than alcohol, but it also means that mercury would fall equally slowly when the thermometer is removed from a pot filled with boiling water. 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. The other wire is can move along a threaded rod. that how thermometers work, they have a little bit of liquid in them and it expands and goes up. Why Does Your Smartphone Lose Charge, Even When You Don’t Use It? Mercury is a neurotoxin, and if you are exposed to it outside of its typical glass thermometer tube, it can cause you to go deaf, experience tremors, memory loss, and partial blindness, among other awful permanent side effects. 2. Circle Of Willis: Anatomy, Diagram And Functions, Sheepshead Fish: Facts About The Fish With Human Teeth. Metallic mercury is toxic, and also expensive. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. Mercury thermometers are being phased out as the metal is toxic if the thermometer breaks. hope this is correct. 1 However, unlike alcohol, mercury isn’t colorless, a property that forces manufacturers to add artificial dyes to alcohol to make it clearly visible. What’s the Difference Between Virtual Reality And Augmented Reality? Get the answers you need, now! The tube must be very narrow to minimise the amount of mercury in … Many older thermometers contained mercury. How Big Is It and Does It Bite? Like all substances, mercury linearly expands as temperature increases. It expands on providing heat to it. Mercury thermometers are used in households, laboratory experiments, and industrial applications. 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? | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. 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. Hence, the slightest change in temperature is notable when it's used in a thermometer. When two bodies touch, their temperature adjusts, which means that the colder gets warmer, the warmer gets colder. Mercury’s is about six times less that of alcohol. This means you can subject the mercury in a thermometer to heat and it will react. Mercury has a boiling point which makes it suitable to measure higher temperatures. Therefore, initially, thermometers defined temperatures. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. Still, despite their small flaws, mercury thermometers are regarded to be one of the most accurate thermometers available. This was the first thermometer because it was marked with a scale. When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. 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. 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. What Is The Huntsman Spider? 0 0. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. One of them is fixed. Mercury is the only metal that is in liquid state at room temperature. Actually, we try to avoid it these days. Dec 20,2020 - Why mercury is used in thermometer? Furthermore I know that it doesn't stick to the sides of the thermometer. Although mercury thermometers pose many benefits to users, they also have their drawbacks. Why Are There Stones Along Railway Tracks? Mercury is available in pure form. That is why mercury is used in thermometers. … 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. Mercury is used in a thermometer because it has a lot of advantages. How Are Prime Numbers Used In Cryptography? 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. All maps, graphics, flags, photos and original descriptions © 2021 worldatlas.com, The Most Abundant Elements In The Earth's Crust, The Hottest And Coldest Planets Of Our Solar System. The mercury in mercury thermometers is poisonous if the thermometer breaks. This means that mercury thermometers cannot measure temperatures below -40ᵒC, a temperature not all that rare in science laboratories or a superconductor technology manufacturing industry. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… Hence, the slightest change in temperature is notable when it's used in a thermometer. Mercury has a lower coefficient of expansion, compared with alcohol. Common household uses of mercury thermometers … Jan 01,2021 - Why mercury is commonly used in clinical thermometer? This transition wasn’t exactly cumbersome, since almost every mercury thermometer was manufactured by Fahrenheit himself. most liquids freeze in temperatures like that. And that reason is “Mercury has a high coefficient of thermal expansion”. Each thermometer contains about .5-1.5 grams of mercury. Mercury is the only one in liquid state at room temperature. - 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. A small change in the temperature causes change in volume of a liquid. ©Pxhere. | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. To avoid this unreliability, Dutch inventor Danie Fahrenheit replaced alcohol with mercury. However, alcohol is so sensitive that these changes cause the alcohol in the tube to behave almost turbulently. Mercury is opaque and bright, so the movement of mercury inside the capillary tube is easily visible. 0 ; View Full Answer Mercury is a good conducter of heat and is very sensitive to heat or coldness therefore telling us the accurate temprature. Why mercury is used in thermometer? This is one of the main reasons to use of mercury in thermometers. A thermometer has two important elements: (1) a temperature sensor (e.g. Question 6. Why is mercury used in thermometer ? Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). why is mercury used in the thermometers? However, if something as abundant and cheap as water works so well, why do we insist on snubbing it for something as extremely rare and expensive as mercury? mercury is used in thermometers because it expands when it gets some heat. Coupling these two properties, a thermometer is formed. The scale, which was slightly altered at a later date, now bears his name. They will be replaced with newer technology such as digital devices, but they will be missed. You can use a thermometer to check if sugar is being melted or burned and if hot oil is ready for frying foods. Mercury thermometers can be used to determine body, liquid, and vapor temperature. ANS :- Mercury is the only one in liquid state at room temperature. Similarly, water in a narrow tube rises or falls when its temperature rises or falls. Faster results for body temperature measurement. It would then immediately reflect the temperature of its new environment. The melting point of water is 0 o c but when you see mercury freezing point (melting point) -38.83 o c and the boiling point of the mercury is 356.73 o c. The boiling point of water is 100 o c. So based on this criteria the mercury is having the temperature reading capacity compared to water. Mercury thermometers cannot measure temperatures below this point. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. Why Are There Stones Alongside Railway Tracks? But the question is; What if we want to measure the temperature below -38.8 °C ? In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. By Victoria Simpson on May 21 2020 in Science. The key thing with thermometers is that they must be accurate and also be able to detect a change in temperature to the smallest degree, and that’s why mercury was first used. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. Why Is Mercury Used In Thermometers? Kelvin thermometers are usually electric … Other factors that make mercury attractive for measuring temperature is the fact that it has a very high boiling point. The mercury thermometer has been used in our life quite much a long time, but it is being taken over by digital thermometers today. Alcohol has a much lower boiling point, and it would not even be able to measure the temperature of boiling water. Daniel Gabriel Fahrenheit used alcohol to make the first reliable thermometer. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). Graphene: The Material That’s Going To Change The Future. (Although it can measure temperatures much lower than mercury can). Log in. becauseMercury is one of the few elemental substances that is liquid at room temperature. The role of a thermometer is an important one, and when used it home it can be the one diagnostic tool that tells us whether we’re sick or not. The main reason why mercury thermometers are being phased out is because of how dangerous they are when broken. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. 1. What is Quantum Entanglement: Explained in Simple Words, Thermoelectric Generator: Principle, Mechanism And Materials. Here we would like to analyze the reasons why digital thermometers are better than normal mercury thermometers on the three aspects below. Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. BUT is mercury also used because the pressure of 760 mm of Hg is … Akash Peshin is an Electronic Engineer from the University of Mumbai, India and a science writer at ScienceABC. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. mercury doesn't boil until 611 degrees Fahrenheit (357 degrees Celsius), and it doesn't stick to glass. A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. In the above section we have seen that the Mercury thermometer measures the lower temperatures upto -38.8 °C. Why is alcohol used in thermometers? Why is mercury used in thermometers despite being the poorest conductor of heat? Do you know the reason behind usage of mercury in thermometer? The advantages of using mercury in a thermometer are as follows: Mercury is a good conductor of heat. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. By confining the mercury to a container of known dimensions, one can determine the ambient temperature based on how much volume a … Disadvantages of a Mercury Thermometer: it took a Long time to measure the body temperature. Source: quora.com. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. 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. To further increase its boiling point, mercury is often sealed with an inert gas, such as nitrogen. How Do Aircraft Find Submarines In Deep Water? The space above the mercury may be filled with nitrogen gas or it may be at Why mercury or alcohol is used in thermometers? 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 . Because mercury has very toxic properties that can lead to sickness or death if the thermometer breaks, more modern thermometers use a form of colored alcohol. Mercury has traditionally been used in thermometers since it expands and contracts consistently with temperature. 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. Alcohol thermometers are considered much safer than the once popular mercury thermometers, but they are considered slightly less durable because the alcohol evaporates from the thermometer over time. Old thermometers must be properly disposed of to prevent environmental contamination. Due to these facts, it is also obviously a substance that is difficult to clean up if ti spills. But the mercury is linear temperature expansion can be observed. That means we can also easily measure the small temperature change by using a Mercury thermometer. One can also extend its freezing point by alloying it with thallium. One of them is fixed. It also has a high boiling point which makes it very suitable to … Because mercury is the only liquid metal and liquids expand more than solids on heating. Answer: Mostly Alcohol and Mercury are used in thermometers as they remain in liquid form even with a change of temperature in them. 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. In addition, mercury is the only metal that is a liquid at room temperature, making it an attractive candidate. To prevent possible contamination, stop using your mercury thermometer. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. This continues until they are warm. Mercury was used in old thermometers because mercury expands when it reaches a certain temperature, so it was a really good "gauge". Imagine two thin wires inside the capillary of your thermometer. Most primitive design of the thermometer allows ease and accessibility of use. Many countries are now moving to phase out the use of mercury thermometers. The essential thermometers, in any case, weren't container or warmth measurers, anyway thermo-scopes, contraptions that basically … 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. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared … However, the liquid he sealed wasn’t water, but alcohol. 2 The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. This capriciousness is disconcerting, as the reading would immediately change when, say, the thermometer is removed from a pot of boiling water whose temperature we wished to measure. Hence, the slightest change in temperature is notable when it's used in a thermometer. This is how every sealed thermometer with liquid works. … Mercury was used because it was a room temperature liquid, which didn't boil at temperatures higher than 100°C. Mercury thermometers are designed utilizing the idea that mercury expands with heat. However, if something as rich and cheap as water can be so effective, why do we insist on using something as rare and expensive as mercury? Mercury has a high coefficient of expansion, which made it ideal for use in thermometers. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? 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. Each thermometer contains about .5-1.5 grams of mercury. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. read more. Mercury boils at 674ᵒF (78.37ᵒC). His device consisted of a tube filled with air whose end was submerged in a tiny bowl of water. reshmasawnani reshmasawnani 14.05.2020 Science Secondary School Why is mercury used in thermometer ? Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature. Mercury can detect even a very small temperature change. Why Is It So Special? Mercury is grey 3. What Would Happen If You Shot A Bullet On A Train? In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. It's used in thermometers because it has high coefficie… Mercury is used in thermometers because. The reading would be effectively undisturbed, making the thermometer superiorly reliable. The invention of the first thermometer is credited to Hero of Alexandria, a curious engineer who is considered the greatest experimenter of antiquity. They cannot be used to measure temperatures above this point. Why Is Mercury Used In Thermometers? Even a small change in temperature causes a drastic change in its volume along the tube. 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 has a higher coefficient of expansion than water, which means that changes in its volume with temperature are more noticeable. Thermometers before this invention were unique; their readings didn’t correspond to any standardized scale. credit: medicalindicators.com. 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. Share with your friends. Heat makes atoms move about more rapidly, thus increasing the kinetic energy in a substance. Now, they stopped making thermometers with mercury … Best Answers. Even Galileo’s invention worked on the same principle. Therefore, initially, thermometers defined temperatures. Hence, the slightest change in temperature is notable when it's used in a thermometer… How Do We Get Wool From Sheep And How It Is Converted Into Clothes. 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. Mercury thermometers are being phased out in the US. A mercury thermometer is a tool used to measure temperature. Why Are Laptops Getting Lighter And Slimmer? However, the amount of expansion per degree increase in temperature is different for every material. Why mercury is used as a thermometric fluid ? Why Is Mercury Used In Thermometers? The substance expands and moves up the thermometer. When the temperature changes, the mercury expands and contracts, the temperature can then be read on the scale. Mercury thermometer: AD 1714-1742. Household Uses of Mercury Thermometers. Mercury is used in thermometers because it has high coefficient of expansion. Mercury is a highly toxic liquid; therefore, it should be handled with care especially if the thermometer is broken. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. Most metals are good conductors of heat and they are solids at room temperature. Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. Excess heat often causes the tires to bloat in summers. Mercury thermometers have long been considered the most accurate liquid-filed types. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments. It is identified by its familiar silver metallic color. 1. Mercury Thermometer. 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