Why Is Mercury 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 . This is how every sealed thermometer with liquid works. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. 0 0. That is why mercury is used in thermometers. What’s more, alcohol’s freezing point is an astonishing -115ᵒC compared to mercury’s -40ᵒC. Why mercury or alcohol is used in thermometers? Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. 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. When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. ANS :- Mercury is the only one in liquid state at room temperature. While nothing can be done about mercury’s rarity, expensiveness and toxicity, one can still overcome its thermal limitations. The scale, which was slightly altered at a later date, now bears his name. Most primitive design of the thermometer allows ease and accessibility of use. | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. 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. hope this is correct. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. However, its value is almost six times less than that of alcohol. Thermometers containing a blue or red color liquid are most often utilizing an organic fluid, usually alcohol-based. The alcohol would have cooled down too fast. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. Still, despite their small flaws, mercury thermometers are regarded to be one of the most accurate thermometers available. Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. Like all substances, mercury linearly expands as temperature increases. However, alcohol is so sensitive that these changes cause the alcohol in the tube to behave almost turbulently. Hence, the slightest change in temperature is notable when it's used in a thermometer… most liquids freeze in temperatures like that. His device consisted of a tube filled with air whose end was submerged in a tiny bowl of water. Hence, the slightest change in temperature is notable when it's used in a thermometer. Do you know the reason behind usage of mercury in thermometer? Log in. Share 0. mercury is a good condutor of heat. Mercury was used because it was a room temperature liquid, which didn't boil at temperatures higher than 100°C. 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. Mercury’s is about six times less that of alcohol. Alcohol’s hypersensitivity can be compensated by its virtues. Mercury can detect even a very small temperature change. It expands on providing heat to it. What is Quantum Entanglement: Explained in Simple Words, Thermoelectric Generator: Principle, Mechanism And Materials. Why Is Mercury Used In Thermometers? Because of alcohol’s high coefficient of expansion, mercury was chosen as a better candidate for filling thermometers. Why Is Mercury Used In Thermometers? 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. How Do We Get Wool From Sheep And How It Is Converted Into Clothes. Mercury is used in thermometers because. 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. On the other hand, alcohol poses no such threat. Now, they stopped making thermometers with mercury … Why Is It So Special? This is how every sealed thermometer with liquid works. Mercury was used in old thermometers because mercury expands when it reaches a certain temperature, so it was a really good "gauge". | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. A small change in the temperature causes change in volume of a liquid. Why Are Laptops Getting Lighter And Slimmer? The reading would be effectively undisturbed, making the thermometer superiorly reliable. This means you can subject the mercury in a thermometer to heat and it will react. They cannot be used to measure temperatures above this point. 2. The break in the column of mercury is visible. 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. Therefore, initially, thermometers defined temperatures. One can also extend its freezing point by alloying it with thallium. This continues until they are warm. Mercury thermometers are being phased out in the US. 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. 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. Although mercury thermometers pose many benefits to users, they also have their drawbacks. Mercury powers itself, making it an attractive substance. Why is mercury used in thermometer ? History . The substance expands and moves up the thermometer. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. However, unlike alcohol, mercury isn’t colorless, a property that forces manufacturers to add artificial dyes to alcohol to make it clearly visible. Question 6. It's used in thermometers because it has high coefficient of expansion. Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. This material constant is called the coefficient of expansion. And because of this reason we use mercury in thermometers. The mercury thermometer has been used in our life quite much a long time, but it is being taken over by digital thermometers today. Circle Of Willis: Anatomy, Diagram And Functions, Sheepshead Fish: Facts About The Fish With Human Teeth. 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. The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam. 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. Mercury thermometers are used in households, laboratory experiments, and industrial applications. Faster results for body temperature measurement. Hence our body temperature is observed by melting the liquid metal mercury due to our body temperature. The only trouble with alcohol as a measuring instrument, however, is that it reacts to changes in temperature too quickly. 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? hope this is correct. However, Fahrenheit proposed a scale that was adopted by every manufacturer of mercury and eventually, every type of thermometer. Why is mercury used in thermometer ? Close-up of a mercury-filled maximum thermometer. 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. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. The thermometer usually has a small reserve of liquid mercury in … Mercury is grey 3. Mercury thermometers will not be seen for much longer in people’s homes. Mercury thermometers can be used to determine body, liquid, and vapor temperature. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. 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. Mercury has a boiling point which makes it suitable to measure higher temperatures. It is also cheap to acquire and very accurate at measuring high temperatures. How Did The Nintendo Game Duck Hunt Work? A lab might be required to be sealed for hours if a mercury thermometer breaks, considering that inhaling mercury can cause health serious problems. That means Mercury expands or contracts with even a very small change in temperature. The mercury in mercury thermometers is poisonous if the thermometer breaks. Here you will come to know the reason why alcohol is used in Thermometers. Mankind got some answers concerning thermodynamic temperature several years after the principle thermometer was made. A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. Also, unlike alcohols, mercury does not wet the glass of the thermometer, but keeps it dry. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? You can use one to detect a fever, and people also often use them in cooking in order to determine if a roast is cooked to the proper temperature. The space above the mercury may be filled with nitrogen gas or it may be at 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. However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. To prevent possible contamination, stop using your mercury thermometer. Why are we using Mercury in thermometer, reasons are followed:. This prevents … Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. Why Does Your Smartphone Lose Charge, Even When You Don’t Use It? Mercury is the only metal that is in liquid state at room temperature. These new mercury-thallium thermometers can now measure temperatures as low as -62ᵒC. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Thermometers are a useful thing to have in your home. A mercury thermometer is a tool used to measure temperature. 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. Each thermometer contains about .5-1.5 grams of mercury. why is mercury used in the thermometers? 2 (Although it can measure temperatures much lower than mercury can). Many older thermometers contained mercury. why is mercury used in thermometer. 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. In addition, mercury is the only metal that is a liquid at room temperature, making it an attractive candidate. A small volume of silver color mercury liquid is used inside the mercury thermometer. Mercury thermometers are designed utilizing the idea that mercury expands with heat. Share with your friends. Join now. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments. This is the working principle of every sealed, liquid-containing thermometer. Furthermore I know that it doesn't stick to the sides of the thermometer. The other wire is can move along a threaded rod. By confining the mercury to a container of known dimensions, one can determine the ambient temperature based on how much volume a … - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. 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. Actually, we try to avoid it these days. The tube must be very narrow to minimise the amount of mercury in … Why Is Mercury Used In Thermometers? read more. Log in. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). Unlike mercury, alcohol is much cheaper and not as ridiculously rare. 1. We could have used a material that changes color when subjected to heat. 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 and its compounds have the ability to cause severe neurological problems and other serious symptoms in humans when they are exposed to it. Mercury thermometers are used in households, laboratory experiments, and industrial applications. Hence, the slightest change in temperature is notable when it's used in a thermometer. What Would Happen If You Shot A Bullet On A Train? The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… It is used in thermometers because it has a high coefficient of expansion which makes it easy to move in the thermometers as per the temperatures. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. How Are Prime Numbers Used In Cryptography? Why Are There Stones Alongside Railway Tracks? 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