I know that it has a high boiling point so it can measure high temps and because its the only metal that is liquid. Mercury thermometers will not be seen for much longer in people’s homes. BUT is mercury also used because the pressure of 760 mm of Hg is … 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. 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. It would then immediately reflect the temperature of its new environment. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). credit: medicalindicators.com. 2. The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. The scale, which was slightly altered at a later date, now bears his name. Mercury can detect even a very small temperature change. Mercury boils at 674ᵒF (78.37ᵒC). Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. The other wire is can move along a threaded rod. read more. The thermometer usually has a small reserve of liquid mercury in … 1. (Although it can measure temperatures much lower than mercury can). A mercury thermometer is a tool used to measure temperature. Actually, we try to avoid it these days. What Is The Huntsman Spider? When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. 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? 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. How Do We Get Wool From Sheep And How It Is Converted Into Clothes. This is one of the main reasons to use of mercury in thermometers. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. hope this is correct. ANS :- Mercury is the only one in liquid state at room temperature. Why Is Mercury Used In Thermometers? This is the working principle of every sealed, liquid-containing thermometer. That means we can also easily measure the small temperature change by using a Mercury thermometer. 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. Dec 20,2020 - Why mercury is used in thermometer? 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. why is mercury used in thermometer. 1. Therefore, initially, thermometers defined temperatures. 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 . It also has a high boiling point which makes it very suitable to … Mercury thermometers are designed utilizing the idea that mercury expands with heat. The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam. Do you know the reason behind usage of mercury in thermometer? Excess heat often causes the tires to bloat in summers. Compare that meager boiling point to mercury’s incredible 356.7ᵒC boiling point! Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. History . In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. What is Quantum Entanglement: Explained in Simple Words, Thermoelectric Generator: Principle, Mechanism And Materials. 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. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared … Like all substances, mercury linearly expands as temperature increases. They cannot be used to measure temperatures above this point. Thermometers are a useful thing to have in your home. Circle Of Willis: Anatomy, Diagram And Functions, Sheepshead Fish: Facts About The Fish With Human Teeth. 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. The break in the column of mercury is visible. But the mercury is linear temperature expansion can be observed. One of them is fixed. Coefficient Of Restitution: Definition, Explanation And Formula. Best Answers. 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. The invention of the first thermometer is credited to Hero of Alexandria, a curious engineer who is considered the greatest experimenter of antiquity. The reading would be effectively undisturbed, making the thermometer superiorly reliable. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. This continues until they are warm. Mercury’s is about six times less that of alcohol. 1. However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. Log in. 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. Alcohol expands rapidly when it heats up. Share with your friends. Alcohol is favored over water for the simple reason that it boasts a higher coefficient of expansion. However, unlike alcohol, mercury isn’t colorless, a property that forces manufacturers to add artificial dyes to alcohol to make it clearly visible. Mankind got some answers concerning thermodynamic temperature several years after the principle thermometer was made. 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. Mercury has a lower coefficient of expansion, compared with alcohol. The advantages of using mercury in a thermometer are as follows: Mercury is a good conductor of heat. 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. The alcohol would have cooled down too fast. Also, while alcohol can measure shockingly low temperatures, it is unable to measure temperatures greater than just 78.37ᵒC, alcohol’s boiling point. Why is mercury used in thermometer ? The tube must be very narrow to minimise the amount of mercury in … The inert gas increases the pressure on the liquid mercury, thereby increasing its boiling point even further. Mercury is grey 3. Why mercury is used in thermometer? Why Are Laptops Getting Lighter And Slimmer? 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. While nothing can be done about mercury’s rarity, expensiveness and toxicity, one can still overcome its thermal limitations. How Did The Nintendo Game Duck Hunt Work? In addition, mercury is the only metal that is a liquid at room temperature, making it an attractive candidate. Mercury Thermometer. 1. … most liquids freeze in temperatures like that. It is a shining metal and when it expands, the expansion can be easily seen. 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. Graphene: The Material That’s Going To Change The Future. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer… Mercury in its liquid form has traditionally been used because of its fluid properties of separation and adherence through temperature extremes. Similarly, water in a narrow tube rises or falls when its temperature rises or falls. Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. Imagine two thin wires inside the capillary of your thermometer. A small change in the temperature causes change in volume of a liquid. 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? 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. To avoid this unreliability, Dutch inventor Danie Fahrenheit replaced alcohol with mercury. 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. hope this is correct. Join now. A thermometer has two important elements: (1) a temperature sensor (e.g. We could have used a material that changes color when subjected to heat. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. 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. What Is The Fibonacci Sequence? Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. Why Is Mercury Used In Thermometers? 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