Question 6. 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. How Do Screen Protectors Protect A Phone’s Screen? What Is The Huntsman Spider? Source: quora.com. Share 0. mercury is a good condutor of heat. Why Is It So Special? Consequently, at first, thermometers portrayed temperatures. In the above section we have seen that the Mercury thermometer measures the lower temperatures upto -38.8 °C. Why Is Mercury Used In Thermometers? 1 A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. Each thermometer contains about .5-1.5 grams of mercury. So mercury level indicates the temperature as quickly as possible and accurately. most liquids freeze in temperatures like that. 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. But the question is; What if we want to measure the temperature below -38.8 °C ? - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. Imagine two thin wires inside the capillary of your thermometer. A small change in the temperature causes change in volume of a liquid. One of them is fixed. It has lower freezing point and higher boiling point. … Why Mercury Is Used In The 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. 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? On the other hand, alcohol poses no such threat. Most metals are good conductors of heat and they are solids at room temperature. Here we would like to analyze the reasons why digital thermometers are better than normal mercury thermometers on the three aspects below. 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 increase in volume is evident in solids, such as metallic railway tracks, rubber tires and fluids like water, alcohol, mercury and halogen. Mercury is used in thermometers because. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. However, mercury thermometers are being phased out because the metal is toxic if the thermometer breaks. Mercury thermometers have long been considered the most accurate liquid-filed types. It's used in thermometers because it has high coefficie… Why mercury or alcohol is used in thermometers? Why mercury is used as a thermometric fluid ? The mercury thermometer has been used in our life quite much a long time, but it is being taken over by digital thermometers today. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. 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. This continues until they are warm. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. This is how every sealed thermometer with liquid works. Dec 20,2020 - Why mercury is used in thermometer? It is a shining metal and when it expands, the expansion can be easily seen. Why mercury is used in thermometer? Metallic mercury is toxic, and also expensive. History . Excess heat often causes the tires to bloat in summers. 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. 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. 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. Dec 20,2020 - Why mercury is used in thermometer? | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. Before mercury came along in thermometers, alcohol was discovered as a substance that was great for measuring temperatures. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. Even a small change in temperature causes a drastic change in its volume along the tube. Therefore, initially, thermometers defined temperatures. It is a better choice to measure … But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. 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. Thermometers are a useful thing to have in your home. Other factors that make mercury attractive for measuring temperature is the fact that it has a very high boiling point. Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. 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 are used in households, laboratory experiments, and industrial applications. Circle Of Willis: Anatomy, Diagram And Functions, Sheepshead Fish: Facts About The Fish With Human Teeth. 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. This is one of the main reasons to use of mercury in thermometers. Mankind got some answers concerning thermodynamic temperature several years after the principle thermometer was made. What’s more, alcohol’s freezing point is an astonishing -115ᵒC compared to mercury’s -40ᵒC. 0 0. However, its value is almost six times less than that of alcohol. The mercury in mercury thermometers is poisonous if the thermometer breaks. Mercury can detect even a very small temperature change. Mercury is available in pure form. Why Is Mercury Used In Thermometers? Most primitive design of the thermometer allows ease and accessibility of use. To further increase its boiling point, mercury is often sealed with an inert gas, such as nitrogen. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. Actually, we try to avoid it these days. Mercury has a lower coefficient of expansion, compared with alcohol. 1. The thermometer should be housed in a casing to protect it from temperature fluctuations. However, mercury is mildly toxic, and mercury has only been used in clinical thermometers if protected from breakage of the tube. Faster results for body temperature measurement. Why Are There Stones Along Railway Tracks? (Although it can measure temperatures much lower than mercury can). 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. Why are we using Mercury in thermometer, reasons are followed:. mercury doesn't boil until 611 degrees Fahrenheit (357 degrees Celsius), and it doesn't stick to glass. One of them is fixed. Because of alcohol’s high coefficient of expansion, mercury was chosen as a better candidate for filling thermometers. 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. Mercury is used in a thermometer because it has a lot of advantages. It also has a high boiling point which makes it very suitable to … A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). Common household uses of mercury thermometers … 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. How Do Aircraft Find Submarines In Deep Water? 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 . 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