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 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. The levels constantly waver with even minor changes in temperature. But the main disadvantage of the mercury thermometer is mercury… Best Answers. A mercury thermometer is a tool used to measure temperature. The break in the column of mercury is visible. Mercury has a boiling point which makes it suitable to measure higher temperatures. Mercury is used in thermometers because it has high coefficient of expansion. 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. why is mercury used in thermometer. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. reshmasawnani reshmasawnani 14.05.2020 Science Secondary School Why is mercury used in thermometer ? The increase in volume is evident in solids, such as metallic railway tracks, rubber tires and fluids like water, alcohol, mercury and halogen. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. 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. Heat makes atoms move about more rapidly, thus increasing the kinetic energy in a substance. … And because of this reason we use mercury in thermometers. This material constant is called the coefficient of expansion. Log in. However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. 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. Furthermore I know that it doesn't stick to the sides of the thermometer. By confining the mercury to a container of known dimensions, one can determine the ambient temperature based on how much volume a … read more. 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? A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. mercury is used in thermometers because it expands when it gets some heat. Hence, the slightest change in temperature is notable when it's used in a thermometer… 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. 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. Also, while alcohol can measure shockingly low temperatures, it is unable to measure temperatures greater than just 78.37ᵒC, alcohol’s boiling point. The scale, which was slightly altered at a later date, now bears his name. To prevent possible contamination, stop using your mercury thermometer. Jan 01,2021 - Why mercury is commonly used in clinical thermometer? Mercury is the only one in liquid state at room temperature. credit: medicalindicators.com. Why is mercury used in thermometers despite being the poorest conductor of heat? Why Mercury Is Used In The Thermometer. 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 . Thermometers containing a blue or red color liquid are most often utilizing an organic fluid, usually alcohol-based. How Do Aircraft Find Submarines In Deep Water? We could have used a material that changes color when subjected to heat. It does not stick to the glass tube. Mercury thermometers are used in households, laboratory experiments, and industrial applications. Why Does Your Smartphone Lose Charge, Even When You Don’t Use It? Imagine two thin wires inside the capillary of your thermometer. Mercury thermometers cannot measure temperatures below this point. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). How Are Prime Numbers Used In Cryptography? The invention of the first thermometer is credited to Hero of Alexandria, a curious engineer who is considered the greatest experimenter of antiquity. But the mercury is linear temperature expansion can be observed. | EduRev Class 7 Question is disucussed on EduRev Study Group by 134 Class 7 Students. Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. Many older thermometers contained mercury. When put under the armpit, the mercury in the clinical … For perspective, the rise or fall in alcohol’s volume per degree rise in temperature would be six times greater than mercury’s volume. Therefore, initially, thermometers defined temperatures. Now, they stopped making thermometers with 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. why is mercury used in the thermometers? 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. Why is mercury used in thermometer ? Alcohol is favored over water for the simple reason that it boasts a higher coefficient of expansion. 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 was used because it was a room temperature liquid, which didn't boil at temperatures higher than 100°C. Mercury is opaque and bright, so the movement of mercury inside the capillary tube is easily visible. Why mercury is used in thermometer? This prevents … To further increase its boiling point, mercury is often sealed with an inert gas, such as nitrogen. That is why mercury is used in thermometers. The thermometer usually has a small reserve of liquid mercury in … These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… They cannot be used to measure temperatures above this point. that how thermometers work, they have a little bit of liquid in them and it expands and goes up. This means you can subject the mercury in a thermometer to heat and it will react. Mercury is used in thermometers because. How Big Is It and Does It Bite? Mercury has quite a few advantages in a thermometer, but other liquids, including water can be used. The inert gas increases the pressure on the liquid mercury, thereby increasing its boiling point even further. Like all substances, mercury linearly expands as temperature increases. Unlike mercury, alcohol is much cheaper and not as ridiculously rare. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. Why Is Mercury Used In Thermometers? What is Quantum Entanglement: Explained in Simple Words, Thermoelectric Generator: Principle, Mechanism And Materials. 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. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. The thermometer should be housed in a casing to protect it from temperature fluctuations. The mercury thermometer has been used in our life quite much a long time, but it is being taken over by digital thermometers today. Mercury thermometer: AD 1714-1742. 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 thermometers can be used to determine body, liquid, and vapor temperature. Mercury thermometers are used in households, laboratory experiments, and industrial applications. Mercury and its compounds have the ability to cause severe neurological problems and other serious symptoms in humans when they are exposed to it. Electronic Thermometers. 1. A small volume of silver color mercury liquid is used inside the mercury thermometer. 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 can detect even a very small temperature change. 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. Due to these facts, it is also obviously a substance that is difficult to clean up if ti spills. 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. 0 0. It has lower freezing point and higher boiling point. A small change in the temperature causes change in volume of a liquid. Daniel Gabriel Fahrenheit used alcohol in thermometers in the 1700s. However, its value is almost six times less than that of alcohol. Mercury thermometers are being phased out as the metal is toxic if the thermometer breaks. History . 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. The tube must be very narrow to minimise the amount of mercury in … 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. Get the answers you need, now! Mercury thermometers are designed utilizing the idea that mercury expands with heat. Actually, we try to avoid it these days. It's used because it expands well in heat. A mercury thermometer is a tool used to measure temperature. This transition wasn’t exactly cumbersome, since almost every mercury thermometer was manufactured by Fahrenheit himself. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. 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. Even Galileo’s invention worked on the same principle. Here you will come to know the reason why alcohol is used in Thermometers. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. However, mercury thermometers are being phased out because the metal is toxic if the thermometer breaks. 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. Also, it is not toxic. 1. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. 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. These new mercury-thallium thermometers can now measure temperatures as low as -62ᵒC. 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. This is how every sealed thermometer with liquid works. Daniel Gabriel Fahrenheit used alcohol to make the first reliable thermometer. What’s more, alcohol’s freezing point is an astonishing -115ᵒC compared to mercury’s -40ᵒC. Answer: Mostly Alcohol and Mercury are used in thermometers as they remain in liquid form even with a change of temperature in them. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. However, mercury is mildly toxic, and mercury has only been used in clinical thermometers if protected from breakage of the tube. Ask your question. Source: quora.com. Mercury boils at 674ᵒF (78.37ᵒC). Mercury thermometers will not be seen for much longer in people’s homes. Hence our body temperature is observed by melting the liquid metal mercury due to our body temperature. … Mercury is used in thermometers because mercury is the only liquid metal in room temperature. 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. Common household uses of mercury thermometers … Mercury thermometers are used in households, laboratory experiments, and industrial applications. Mercury may be found in fever, basal, scientific, industrial and cooking thermometers. 1. They will be replaced with newer technology such as digital devices, but they will be missed. 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 also cheap to acquire and very accurate at measuring high temperatures. The only trouble with alcohol as a measuring instrument, however, is that it reacts to changes in temperature too quickly. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury is the only metal that is in liquid state at room temperature. 2. Dec 20,2020 - Why mercury is used in thermometer? The other wire is can move along a threaded rod. The alcohol would have cooled down too fast. 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? Why Is It So Special? Household Uses of Mercury Thermometers. 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. Alcohol has a much lower boiling point, and it would not even be able to measure the temperature of boiling water. It's used in thermometers because it has high coefficient of expansion. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. 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. Why are we using Mercury in thermometer, reasons are followed:. Mercury in its liquid form has traditionally been used because of its fluid properties of separation and adherence through temperature extremes. Share 0. mercury is a good condutor of heat. Why mercury or alcohol is used in thermometers? Each thermometer contains about .5-1.5 grams of mercury. 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