Traditional mercury LiG thermometers are defined in detail in ASTM Specification E 1, Specification for ASTM Liquid-in-Glass Thermometers. Research has shown that, when used correctly, infrared or no-contact thermometers are just as accurate as oral or rectal thermometers. Today, there is no scientific or metrological reason to employ mercury thermometers for any application.That may come as a surprise. In principle, any substance whose properties visibly change with temperature can be used to measure temperature. Storing thermometers in a vertical storage rack when not in use helps reduce the likelihood of mercury separating again. Mercury is toxic if inhaled or if the liquid touches the skin. No. This is why gold panning works and why mercury is used in the panning process. Once a staple in most medicine cabinets, mercury thermometers use mercury encased in glass to measure body temperature. Mercury was often used in hydrometers as a weight but research indicates that mercury hydrometers are no longer manufactured and sold as new. The mercury thermometer, long a fixture in household medicine cabinets and industrial settings, is going the way of the horse and buggy. 1 Questions & Answers Place. Each thermometer contains about .5-1.5 grams of mercury. If you have a mercury thermometer, don't throw it in the trash. If you have a mercury thermometer in your home and you want to get rid of it, you need to safely dispose of it as hazardous waste. Scale Divisions and Accuracy Limits. These are the traditional thermometers which were used for a long time before they were declared unsafe. Mercury was used because it has a high coefficient of expansion for a liquid, so you could heat it and it would expand, and you could use that to tell temperature. Mercury-free glass thermometer. It was once the most widely used thermometer, but now mercury thermometers are no longer recommended because they can break and have toxic mercury to escape. Both laboratory and clinical studies show that there is no significant difference in the average accuracy of the two types of thermometers, however there is a greater fluctuation of readings of temperature when using electronic thermometers. Mercury Thermometers. This non mercury thermometer. Many older thermometers contained mercury. Mercury Thermometer vs Digital Thermometer vs Infrared Thermometer. I take my temp at 5am and go back to sleep and it still holds temp! One could discern that the temperature is high when the material would radiate hues of blue and that the temperature is low when … Part of the series: Child Care & First Aid. Mercury thermometers are no longer recommended because they can break and allow mercury — which is toxic — to escape. 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. How to Use a Mercury Thermometer. W3ndy2159 in reply to W3ndy2159. are also commonly used in schools. Sphygmomanometers use the most amount of mercury in current medical use. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). It is very reflective, so it's easy to see and to read accurately. Mercury thermometers can be used in temperatures ranging from about -38 to 350°C. Why should you buy a good thermometer? Although the accuracy of axillary temperature measurement is affected by a number of factors, device dwell time and device type are common. There are simpler quicker ways now (disposable plastic covers on electrical thermometers). Try to steer clear of old-style mercury thermometers – mercury is toxic and will be a pain to clean up if you end up breaking it accidentally. These glass thermometers contain mercury in them. 1. Objective . The small silvery ball in a mercury thermometer can be dangerous if the glass breaks and the mercury is not cleaned up properly. Updated on: 22 Oct 2019 by Akash Peshin. The first thermometers manufactured contained water but the fact that water freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury. Mercury and gold have very high atomic weights. Studies conclude that whether a sphygmomanometers is digital or not has no real bearing on its accuracy. Keeps the temperature (just like old mercury ones) until you shake it down. They don't need to be washed, are quick and simple to use, not as fragile, no risk of toxic leakage. #5: Using the Heating Method for rejoining. The mercury will evaporate and can contaminate the surrounding air and become toxic to humans and wildlife. For more information, go to: The tip of a thermometer is inserted into the tongue, armpit, or the rectum to get an accurate reading of a body’s running temperature. A thermometer has two important elements: (1) a temperature sensor (e.g. If you broke a thermometer, clean it up immediately to avoid getting sick and spreading harmful vapors. Non-mercury thermometers have scale divisions equal to mercury thermometers. Although currently there are digital thermometers this form of temperature measurement is still very much in demand, in addition to being very simple to use. By the way, modern miners use arsenic in a manner similar how mercury was used, yet arsenic is also toxic. However, schools and laboratories may still have mercury hydrometers in use. Digital in-ear thermometers (typically £20 to £40) Ear thermometers are quick and easy to use, taking just a few seconds to get a reading – using infrared technology to measure the temperature inside your ear. Mercury is easily the best liquid to use, for 5 important reasons. 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. Compare body temperature between glass mercury thermometer (GMT) and digital thermometer (DT). Method. There are two kinds of glass thermometers, one with mercury and one without mercury. 2. While no non-mercury alternatives are commercially available for energy efficient lighting, fluorescent and HID bulbs should continue to be used and recycled at the end of their useful life. There are serious health risks if a glass mercury thermometer breaks. You can read more about the impact the decision will have in NIST’s February 2011 press release announcing the change. Glass mercury thermometers are no longer recommended and can be dangerous. ... NIST no longer provides calibration services for mercury thermometers. Mercury thermometers are used in: power plants and piping; chemical tanks; heating and cooling equipment; canneries; ships; paint kettles etc. Spirit thermometers use a non-toxic alcohol instead of mercury to register the temperature. 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. The use of a mercury-thallium mixture can extend the low-temperature usability of mercury thermometers to -56°C. The mercury thermometer is a classic design for temperature measurement still used by many families. If you have a choice, it's better to use a thermometer without glass. 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