I really loved the idea of plastic strip thermometers because with mercury thermometers I was always worried about my children dropping the glass vial and breaking it. The thermometer usually has a small reserve of liquid mercury in its base, which is most often pressurized; above it is usually a glass or synthetic tube with a calibrated temperature scale. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. A thermometer has two important elements: (1) a temperature sensor (e.g. I am not sure if it was just the brand that was being used on us at work, but it never got a reading correct without multiple tries, and even that final reading was questionable. I know mercury thermometers are still alive and well in science classes! Gas thermometers. 6 years ago He then developed a system of calibration to create a scale for easy reading. This is mostly done in babies but can used in children up to 3 years of age. Therefore, initially, thermometers defined temperatures. This little known plugin reveals the answer. The ear thermometer is cleaner and less invasive than an oral thermometer, which is what it has going for it, but if I can’t be sure that the temperature is accurate it’s not much use. Increasing the temperature expands and pushes up the fluid in the reservoir and tube. It is also difficult to purchase mercury thermometers for home use in many of these countries. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. Most digital thermometers are easy to use and measure body temperature within seconds. Thallium reduces the freezing point to -78°F (-61.1°C). A laboratory thermometer is recognizable by its long stem with a silver bulb at the end. You can measure your temperature either in the mouth (orally) or in the armpit (axillary). Medical doctors often use a version known as the maximum mercury thermometer to measure human body temperature. A laboratory thermometer is a tool used in laboratories to measure temperature with high accuracy. Mercury can be toxic if consumed, and it can also cause skin and eye damage if touched or respiratory distress if inhaled. This page shows answers for question: Mercury thermometer can be used to measure temperature up to----. A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). Mercury thermometer can be used to measure temperature up to (a) 260°C (b) 100°C (c) 360°C (d) 500°C By means of a maximum thermometer, one can measure the maximum temperature over a predetermined time span. @allenJo - Ask your doctor what medical thermometer they use. Many refuse them, preferring electronic ones. The fluid/ glass thermometer is the most popular thermometer used around the world to measure body temperature. If you have children and they are scared of having their temperature taken in a traditional method you can buy nifty plastic strip thermometers. With changes in temperature, the mercury expands and contracts and the temperature can be read from the scale. In order to measure temperatures below this point, meteorologists will often mix mercury with thallium alloy. Most modern thermometers are made of much stronger glass then their original counterparts, and the amount of mercury contained in each is quite low in any event. read more A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature. The United States has not banned mercury in medical settings, though many advocacy groups have recommended a number of safety precautions. Glass thermometers with alcohol inside may also be used for oral temperatures. The silver color in the bulb normally indicates the presence of mercury. If mercury freezes, nitrogen can be caught behind the metal causing the … There may be clinical thermometers which are build for this range but most will not work above 50 … I think as long as you are careful there is no need to drop $50 or more on a digital thermometer. Note that your temperature is affected by smoking, eating or drinking. usually not no since most clinical thermometers are build to measure human body temperatures which are around 35°C up to 42°C while water boils at 100°C (usual air pressure provided). They were simple, inexpensive, long-lasting, and able to measure a wide temperature span. Electronic components in the thermometer can take very accurate and fast temperature readings. At home I’ve taken different temperature readings when using the ear thermometer and got different results each time, usually off by a degree or two – sometimes within the same hour. Mercury thermometers are no longer recommended because they can break and allow mercury — which is toxic — to escape. Thick glass generally encases the temperature-sensitive liquid metal. Like everything else electronic I remember digital thermometers used to be a little bit more expensive than they are currently! It can be partially or fully immersed in the substance being measured. I'm pretty sure I remember when they started phasing out mercury thermometers for at home use. The freezing point of mercury … It can not be used rectally, since it is very fragile. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Mercury and Glass It used to be the only choice in town, but don't scoff at this old-fashioned thermometer. Alcohol has a much lower boiling point, and it would not even be able to measure the temperature of boiling water. (Although it can measure temperatures much lower than mercury can). The basic instrumentality is usually pretty simple. In order to measure temperatures below this point, meteorologists will often mix mercury with thallium alloy. The German physicist Gabriel Fahrenheit is credited with inventing the first mercury thermometer in 1714, which he made with a glass tube attached to a small well of mercury. They are also safe, since they can withstand temperature extremes without breaking. I remember they did always remind us to be careful and not to drop them. They are painless to use and disposable so you don’t have to worry about cleaning anything. Amazon Doesn't Want You to Know About This Plugin. This has led some people to question the wisdom of having mercury so readily accessible in homes. The use of the mercury thermometer is contraindicated due to health risks, such as respiratory problems or skin damage, but there are also currently glass thermometers similar to the old mercury, called analog thermometers, which do not have mercury in their composition and can be used safely. If you do have a mercury thermometer just make sure to wipe it off with a new alcohol swab after each use so you can disinfect it. Mercury, which is also sometimes known as quicksilver, is a silvery liquid that responds very well to atmospheric changes, particularly temperature and barometric pressure. The number of loci is, Phase lag of the frequency response of a second order system to a sinusoidal forcing function. Mercury-driven thermometers may also be used by meteorologists to measure air temperature. Due to the presence of mercury, it is very dangerous. This introduction of an inert gas increases the pressure on the liquid mercury and therefore its boiling point is increased, this in combination with replacing the Pyrex glass with fused quartz allows the upper temperature range to be extended to 800 °C (1,470 °F). Digital thermometers can be bought at grocery, drug, or medical supply stores. Therefore, the mercury thermometer other thermometers accurately measure the temperature of the human body. It also has a high boiling point which makes it very suitable to measure higher temperatures. Mercury is one of the few metals that are liquid at room temperature. That mercury was secured in a metal tip. I remember when I was very little we used a mercury thermometer and my mom always warned us to be very careful with them. The mercury in the reservoir expands with increased temperature, climbing higher up the thermometer, and it contracts and recedes as the temperature falls. A mercury thermometer is a tool used to measure temperature. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances. I remember using them in every lab science class I ever took in high school and college. Advantages of a Mercury Thermometer: Mercury medical thermometer, due to its characteristics, its performance is more accurate, and close-readings of the gas thermometer, which is used as a reference thermometer. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple. Mercury is a dangerous metal. The American Academy of Pediatricians and the United States Environmental Protection Agency, for instance, have each suggested alternative temperature-measuring devices for personal use in order to reduce the risk of accidental exposure. Carefully read the instructions before using your digital thermometer. Most often it is used to measure body temperature under the arm or in the mouth. can be used for oral, rectal, and axillary or groin temperatures. It linearly expands as temperature increases. Ice point (lower fixed point) – The temperature at which pure ice melts at one atmospheric pressure and is assigned the value of 0 °C. The change in the volume of a fixed mass of gas at constant pressure, or the change in pressure of a fixed mass of gas at constant volume, may be used to measure temperature. The thermometer you purchased offers a safe, accurate and quick temperature reading. I have found that the digital thermometers that you press against your forehead are absolutely terrible. it contains mercury, which is a dangerous element. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. Forehead Thermometer for Adults, The Non Contact Infrared Thermometer for Fever, Body Thermometer and Surface Thermometer 2 in 1 Dual Mode Thermometer 4.6 out of 5 … Within the confines of the thermometer there isn’t usually any safety risk, but should the glass break, exposure is likely. C. Optical pyrometer (disappearing filament type). Liquid thermometers were once the most common type in use. Both work by having a liquid, either alcohol or mercury, enclosed in a vacuum, and the liquid expands as the temperature rises. Nitrogen gas is what usually holds the mercury in place, and usually has to be inserted during the manufacturing process. Higher temperatures cause mercury to grow longer, while low temperatures cause it to fall or shrink back down. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Mercury thermometers cover a wide temperature range from −37 to 356 °C (−35 to 673 °F); the instrument's upper temperature range may be extended through the introduction of an inert gas such as nitrogen. Mercury boils at 674ᵒF (78.37ᵒC). I know that the ear thermometer has become the instrument of choice as physicians got away from the more invasive rectal thermometer, but I wonder if the they are as effective as they claim to be. Any substance that somehow changes with alterations in its temperature can be used as the basic component in a thermometer. Mankind learned about thermodynamic temperature centuries after the first thermometer was invented. Causes of Mercury used in Thermometer – Mercury thermometers can be used to decide the body, liquid, and vapor temperature. I have always preferred mercury thermometers because of how easy they are to use. Determination of ice point. a) 100 b) 250 c) 350 d) 750 Then when I got a little bit older digital thermometers came out and we replaced our mercury thermometer. Standard mercury freezes at -37.89°F (-38.83°C). ¤ Mercury thermometer has mercury inside the bulb as the temperature sensitive fluid, and in alcohol thermometers, it is an alcohol. Most modern models work this way, and though advancements have been made in terms of presentation the basics are usually about the same. The first thermometers, however, weren’t thermos or heat measurers, but thermo-scopes, devices that merely signaled whether the temperature was high or low. There are usually a number of different options and models available depending on the intended use. Thallium reduces the freezing point to -78°F (-61.1°C). Once a staple in most medicine cabinets, mercury thermometers use mercury encased in glass to measure body temperature. Standard mercury freezes at -37.89°F (-38.83°C). I know the hospitals use some digital ear thermometers that are supposed to be rated very high for accuracy, and as a consumer you can buy these models yourself. However, their use is increasingly being restricted to industrial and scientific applications, as safety and environmental issues are demanding stricter laws on the disposal of products containing mercury. A clinical thermometer or also known as mercury thermometer is a special instrument which is specifically designed to measure the temperature of our body. But mercury thermometers continue to be the most popular. A maximum mercury-style thermometer works in much the same way as the standard version, but the mercury does not shrink back into the tip when removed from a heat source. If mercury freezes, nitrogen can be caught behind the metal causing the thermometer to stop working. These thermometers work exactly like bandages and you stick it to your child's skin for a few moments and it gives you a temperature reading. The bulb of the thermometer is immersed into a container filled with pure melting ice. With the strips you stick on you no longer have to worry about any of that. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. There are three types of clinical thermometers mercury, digital and infrared. why are glass thermometers rarely used today? Metal is usually regarded as a good conductor of heat, and Fahrenheit noticed that when that tip was placed into liquids of varying temperatures, the mercury rose and fell in the glass chamber. Historically, mercury thermometers have been used for nearly all temperature measurements because of their accuracy and low cost. Warnings. This method is not as accurate as oral or rectal but can be … Just the same, due to the dangers associated with mercury poisoning, many countries around the world, most notably in Europe, have banned mercury-based thermometers for medical use. This allows temperature readings to be kept until mercury is forced back into the tip by centrifugal force, or shaking the thermometer with the head pointed toward the floor. When the tool is placed outdoors or in the body, the metal tip heats and mercury stretches along the length of hollow space within the tube. These thermometers are usually marked with temperature readings on the Fahrenheit or Celsius scale. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… Resetting of the maximum thermometer is a very simple process which just requires the sharp swinging of the thermometer. If you have a mercury thermometer, don't throw it in the trash. A mercury instrument has been the mainstay of taking temperatures for years. Which of the following is not classified as a thermo electric pyrometer? Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Maximum thermometers are commonly used to measure a person’s body temperature. This is why it can is used to measure body temperature. Related Questions on Process Control and Instrumentation, More Related Questions on Process Control and Instrumentation. A thermometer -- an instrument used to measure air temperature—easily tells us this, but how it tells us is another question entirely. Spilled mercury can be very challenging to clean, since the loose liquid often forms rounded “balls” that can bounce and scatter across a floor or room. It ranges from -10˚C to 110˚C. In some instances they’re also used in kitchens, usually as a way of monitoring warm liquids, but most modern chefs prefer more food-specific gauges. In a maximum thermometer, the liquid is pushed up the glass tube, but cannot fall easily when the temperature lowers. In order to ensure that the contact between the bulb and ice is good, ice shavings can be used. These sorts of thermometers are most commonly used in medicine and meteorology. @SZapper - I remember when the digital thermometers for at home use came out too. The gas thermometer consists of a flexible U-tube of mercury connected by a capillary tube to a vessel containing gas. This thermometer eliminates any worries about broken glass or mercury hazards. Mercury, which is a chemical element, rises and falls in response to temperature changes, and watching where it stops along the scale provides a reading of how hot or cold a particular substance is. The maximum temperature over a set period of time can be observed after the thermometer is removed from the environment. Mercury thermometer is based on the principle of change of volume with rise of temperature and can measure temperatures ranging from -30°C to 357°C. Find right answer with solution and explaination of asked question. Many of these tools are used in medicine and around the home to gauge body temperature, though they can also be used outside and in more professional meteorological situations. Rate and follow the question.Get Answer key for asked question. This type can be used either orally, which is to say slipped under the tongue, or rectally. Maybe I’m not using it properly, I don’t know. Do not clean up spilled mercury with bare hands. Mercury-driven thermometers may also be used by meteorologists to measure air temperature. Learn about a little known plugin that tells you if you're getting the best price on Amazon. In addition, mercury is the only metal that is a liquid at room temperature, making it an attractive candidate. I think you can get them for under $50. ¤ Alcohol thermometers can be used to measure very low temperatures. Is Amazon actually giving you the best price? Colored alcohol or mercury rises along a scale in a bulb thermometer whereas expanding liquid rotates a spring to turn an indicator needle around along a circular scale on a spring thermometer. If a mercury thermometer breaks or leaks, it can release toxic vapors. You can take rectal temperatures in children older than 3 years, but it might be difficult to keep them as still as they need to stay. Another reason for mercury to be used in a thermometer is because it remains in a liquid state up to 300 degrees Celsius. Axillary: For this method, the thermometer is placed in the armpit for young children or adults whose temperature can’t safely be done orally. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. ¤ Since alcohol is non toxic, alcohol thermometers are much safer to use than the mercury thermometers. 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