Mercury’s is about six times less that of alcohol. 2 The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. Mercury thermometers are used in households, laboratory experiments, and industrial applications. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. Mercury also has a high coefficient of expansion, but it is not too high. This is the working principle of every sealed, liquid-containing 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. Kelvin thermometers are usually electric … 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. Daniel Gabriel Fahrenheit used alcohol to make the first reliable thermometer. However, its value is almost six times less than that of alcohol. We could have used a material that changes color when subjected to heat. However, alcohol is so sensitive that these changes cause the alcohol in the tube to behave almost turbulently. Mercury is used in thermometers because mercury is the only liquid metal in room temperature. This means you can subject the mercury in a thermometer to heat and it will react. 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. ©Pxhere. Answer Mercury is one of the few elemental substances that is liquid at room temperature. Why Mercury Is Used In The Thermometer. Heat makes atoms move about more rapidly, thus increasing the kinetic energy in a substance. Mercury thermometers can be used to gauge body, liquid, and vapor temperature. Mercury thermometers are being phased out as the metal is toxic if the thermometer breaks. The essential thermometers, in any case, weren't container or warmth measurers, anyway thermo-scopes, contraptions that basically … Hence, the slightest change in temperature is notable when it's used in a thermometer. Get the answers you need, now! Why Is Mercury Used In Thermometers? It expands on providing heat to it. 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. Hence our body temperature is observed by melting the liquid metal mercury due to our body temperature. The scale, which was slightly altered at a later date, now bears his name. 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. Mercury thermometers can be used to determine body, liquid, and vapor temperature. History . These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… Old thermometers must be properly disposed of to prevent environmental contamination. 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. Log in. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. What Is The Huntsman Spider? Most metals are good conductors of heat and they are solids at room temperature. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. These new mercury-thallium thermometers can now measure temperatures as low as -62ᵒC. 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. Alcohols, such as ethanol, boil at about 78 degrees Celsius (172 degrees Fahrenheit). Although mercury thermometers pose many benefits to users, they also have their drawbacks. Mercury is the only one in liquid state at room temperature. History . hope this is correct. Akash Peshin is an Electronic Engineer from the University of Mumbai, India and a science writer at ScienceABC. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Why is mercury used in thermometer ? However, the amount of expansion per degree increase in temperature is different for every material. Thermometers containing a blue or red color liquid are most often utilizing an organic fluid, usually alcohol-based. why is mercury used in thermometer. However, unlike alcohol, mercury isn’t colorless, a property that forces manufacturers to add artificial dyes to alcohol to make it clearly visible. We measure this temperature by measuring expansion of a liquid in thermometer. 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. (Although it can measure temperatures much lower than mercury can). Alcohol expands rapidly when it heats up. It also has a high boiling point which makes it very suitable to … 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 mercury is used in thermometer? Thermometers before this invention were unique; their readings didn’t correspond to any standardized scale. The substance expands and moves up the thermometer. Why is mercury used in thermometer ? Since it is a metal, it has a stable coefficient of expansion hence it expands uniformly and noticeably for a slight change of temperature. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked. Alcohol has a much lower boiling point, and it would not even be able to measure the temperature of boiling water. 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? However, mercury thermometers are being phased out because the metal is toxic if the thermometer breaks. Visual indicators are marked in degrees Fahrenheit, Centigrade or both. hope this is correct. Still, despite their small flaws, mercury thermometers are regarded to be one of the most accurate thermometers available. Therefore, initially, thermometers defined temperatures. Faster results for body temperature measurement. The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. However, not only were these developments bereft of any scale, but they were also sensitive to the air’s pressure. How Do Aircraft Find Submarines In Deep Water? Imagine two thin wires inside the capillary of your thermometer. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. 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. What Is The Fibonacci Sequence? Thermometers are a useful thing to have in your home. Share with your friends. It is a shining metal and when it expands, the expansion can be easily seen. It's used because it expands well in heat. | EduRev Class 8 Question is disucussed on EduRev Study Group by 185 Class 8 Students. Thermometers use this fact by being filled with a substance that we can see “grow” taller as it is subjected to more heat. 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. Mercury was used in old thermometers because mercury expands when it reaches a certain temperature, so it was a really good "gauge". A mercury thermometer is a tool used to measure temperature. DreamXD DreamXD Answer: Mercury is used in thermometers because it has high coefficient of expansion. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments. 1. The space above the mercury may be filled with nitrogen gas or it may be at This is how every sealed thermometer with liquid works. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. read more. Imagine two thin wires inside the capillary of your thermometer. Mercury thermometers are designed utilizing the idea that mercury expands with heat. But the main disadvantage of the mercury thermometer is mercury… - May 11, 2019 - Similarly, when the temperature rises or falls, the water in a small glass tube rises or falls. Mercury boils at 674ᵒF (78.37ᵒC). How Are Prime Numbers Used In Cryptography? Mercury has a higher coefficient of expansion than water, which means that changes in its volume with temperature are more noticeable. Actually, we try to avoid it these days. 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 . 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. Mercury and other liquid thermometers cannot be used to measure temperatures in kelvins. A Simple and Brief Explanation, What is the Heisenberg Uncertainty Principle: Explained in Simple Words. 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. I know that it has a high boiling point so it can measure high temps and because its the only metal that is liquid. The mercury in mercury thermometers is poisonous if the thermometer breaks. Water having the property of condensation but the mercury has no condensation property which is helpful to expect the exact values compared to water. In a mercury thermometer, a small glass cylinder is filled with mercury, and a standardized temperature scale is marked on the tube. Coupling these two properties, a thermometer is formed. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Why is mercury used in thermometers despite being the poorest conductor of heat? 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. Each thermometer contains about .5-1.5 grams of mercury. Compare that meager boiling point to mercury’s incredible 356.7ᵒC boiling point! the visible scale that is marked on a mercury-in-glass thermometer or the digital readout on an infrared … His device consisted of a tube filled with air whose end was submerged in a tiny bowl of water. In the above section we have seen that the Mercury thermometer measures the lower temperatures upto -38.8 °C. Even Galileo’s invention worked on the same principle. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. Many countries are now moving to phase out the use of mercury thermometers. 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. Join now. 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