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. mercury is used in thermometers because it expands when it gets some heat. Close-up of a mercury-filled maximum thermometer. The essential thermometers, in any case, weren't container or warmth measurers, anyway thermo-scopes, contraptions that basically … 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. 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. 1. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. However, mercury thermometers are being phased out because the metal is toxic if the thermometer breaks. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. What’s the Difference Between Virtual Reality And Augmented Reality? … … A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. Alcohol was discovered as being great for this back in the 1700s. | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. Mercury thermometers are used in households, laboratory experiments, and industrial applications. Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. How Did The Nintendo Game Duck Hunt Work? Join now. ©Pxhere. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Mercury thermometers cannot measure temperatures below this point. The advantages of using mercury in a thermometer are as follows: Mercury is a good conductor of heat. History . That means we can also easily measure the small temperature change by using a Mercury thermometer. the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared … Each thermometer contains about .5-1.5 grams of mercury. This continues until they are warm. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. Why Is Mercury Used In Thermometers? 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. Kelvin thermometers are usually electric … Why Are There Stones Along Railway Tracks? mercury doesn't boil until 611 degrees Fahrenheit (357 degrees Celsius), and it doesn't stick to glass. 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. It is a better choice to measure … Log in. The inert gas increases the pressure on the liquid mercury, thereby increasing its boiling point even further. The mercury thermometer has been used in our life quite much a long time, but it is being taken over by digital thermometers today. One can also extend its freezing point by alloying it with thallium. 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? Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. The thermometer should be housed in a casing to protect it from temperature fluctuations. Most metals are good conductors of heat and they are solids at room temperature. This prevents … This was the first thermometer because it was marked with a scale. Disadvantages of a Mercury Thermometer: it took a Long time to measure the body temperature. This means you can subject the mercury in a thermometer to heat and it will react. that how thermometers work, they have a little bit of liquid in them and it expands and goes up. When the thermoscope touched a hot or cold surface, the air would expand or contract, causing the air-water interface to fluctuate. Alcohol has a much lower boiling point, and it would not even be able to measure the temperature of boiling water. While nothing can be done about mercury’s rarity, expensiveness and toxicity, one can still overcome its thermal limitations. Mercury also has a high coefficient of expansion, but it is not too high. 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. 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. A thermometer has two important elements: (1) a temperature sensor (e.g. Coefficient Of Restitution: Definition, Explanation And Formula. To avoid this unreliability, Dutch inventor Danie Fahrenheit replaced alcohol with mercury. How Big Is It and Does It Bite? Imagine two thin wires inside the capillary of your thermometer. Mercury thermometers have long been considered the most accurate liquid-filed types. Electronic Thermometers. It would then immediately reflect the temperature of its new environment. Even Galileo’s invention worked on the same principle. Many older thermometers contained mercury. The space above the mercury may be filled with nitrogen gas or it may be at This material constant is called the coefficient of expansion. 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. Although mercury thermometers pose many benefits to users, they also have their drawbacks. 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. most liquids freeze in temperatures like that. By Victoria Simpson on May 21 2020 in Science. Mercury and its compounds have the ability to cause severe neurological problems and other serious symptoms in humans when they are exposed to it. It is a shining metal and when it expands, the expansion can be easily seen. So mercury level indicates the temperature as quickly as possible and accurately. Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). Also, it is not toxic. His device consisted of a tube filled with air whose end was submerged in a tiny bowl of water. Each thermometer contains about .5-1.5 grams of mercury. Why are we using Mercury in thermometer, reasons are followed:. why is mercury used in thermometer. hope this is correct. Mercury is the only one in liquid state at room temperature. why is mercury used in the thermometers? Daniel Gabriel Fahrenheit used alcohol in thermometers in the 1700s. It does not stick to the glass tube. 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. Mercury powers itself, making it an attractive substance. 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. 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. Answer Mercury is one of the few elemental substances that is liquid at room temperature. Mercury Thermometer. This is the working principle of every sealed, liquid-containing thermometer. mercury has a liquid form at room temperature and ­doesn't become a solid until it reaches -38 degrees Fahrenheit (-39 degrees Celsius). This is how every sealed thermometer with liquid works. 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. Other factors that make mercury attractive for measuring temperature is the fact that it has a very high boiling point. Graphene: The Material That’s Going To Change The Future. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. Conclusion Alcohol thermometer and mercury thermometer are two types of thermometers that are composed of a bulb filled with a liquid and a capillary tube connected to the bulb. However, alcohol is so sensitive that these changes cause the alcohol in the tube to behave almost turbulently. Old thermometers must be properly disposed of to prevent environmental contamination. One of them is fixed. The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam. How Do We Get Wool From Sheep And How It Is Converted Into Clothes. Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. Mercury can detect even a very small temperature change. Coupling these two properties, a thermometer is formed. 2 Why Are There Stones Alongside Railway Tracks? Why is alcohol used in thermometers? Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. Now, they stopped making thermometers with mercury … Log in. The mercury in mercury thermometers is poisonous if the thermometer breaks. 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. And that reason is “Mercury has a high coefficient of thermal expansion”. However, the liquid he sealed wasn’t water, but alcohol. Mercury boils at 674ᵒF (78.37ᵒC). Alcohol is favored over water for the simple reason that it boasts a higher coefficient of expansion. The thermometer usually has a small reserve of liquid mercury in … With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. hope this is correct. The scale, which was slightly altered at a later date, now bears his name. 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 Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. 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? Mercury has traditionally been used in thermometers since it expands and contracts consistently with temperature. Invention of the most accurate thermometers available as low as -62ᵒC put under armpit... Are most often utilizing an organic fluid, usually alcohol-based two thin wires inside capillary! They will be missed main disadvantage of the thermometer breaks to cause severe neurological problems and other serious symptoms humans. 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