Digital thermometers can be bought at grocery, drug, or medical supply stores. They were simple, inexpensive, long-lasting, and able to measure a wide temperature span. 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. Most modern models work this way, and though advancements have been made in terms of presentation the basics are usually about the same. These sorts of thermometers are most commonly used in medicine and meteorology. There are usually a number of different options and models available depending on the intended use. Standard mercury freezes at -37.89°F (-38.83°C). 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). The silver color in the bulb normally indicates the presence of mercury. Warnings. The basic instrumentality is usually pretty simple. Mercury boils at 674ᵒF (78.37ᵒC). it contains mercury, which is a dangerous element. With changes in temperature, the mercury expands and contracts and the temperature can be read from the scale. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. @allenJo - Ask your doctor what medical thermometer they use. 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). In a maximum thermometer, the liquid is pushed up the glass tube, but cannot fall easily when the temperature lowers. Thick glass generally encases the temperature-sensitive liquid metal. There are a number of different model types, sizes, and specifications, but the general operating principle is about the same in all cases. Most often it is used to measure body temperature under the arm or in the mouth. 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. can be used for oral, rectal, and axillary or groin temperatures. Amazon Doesn't Want You to Know About This Plugin. Higher temperatures cause mercury to grow longer, while low temperatures cause it to fall or shrink back down. It can not be used rectally, since it is very fragile. Related Questions on Process Control and Instrumentation, More Related Questions on Process Control and Instrumentation. Any substance that somehow changes with alterations in its temperature can be used as the basic component in a thermometer. read more Note that your temperature is affected by smoking, eating or drinking. Therefore, the mercury thermometer other thermometers accurately measure the temperature of the human body. These thermometers are usually marked with temperature readings on the Fahrenheit or Celsius scale. I think you can get them for under $50. Medical doctors often use a version known as the maximum mercury thermometer to measure human body temperature. Some of them will deliver temperature readings within two to three seconds rather than forcing you to wait for almost a minute as with other consumer grade digital thermometers. This little known plugin reveals the answer. Mercury thermometer can be used to measure temperature up to (a) 260°C (b) 100°C (c) 360°C (d) 500°C Determination of ice point. Which of the following is not classified as a thermo electric pyrometer? Due to the presence of mercury, it is very dangerous. Resetting of the maximum thermometer is a very simple process which just requires the sharp swinging of the thermometer. Mercury is a dangerous metal. 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. I'm pretty sure I remember when they started phasing out mercury thermometers for at home use. A mercury thermometer is a tool used to measure temperature. There may be clinical thermometers which are build for this range but most will not work above 50 … It is also difficult to purchase mercury thermometers for home use in many of these countries. 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 ∞. Mercury, which is also sometimes known as quicksilver, is a silvery liquid that responds very well to atmospheric changes, particularly temperature and barometric pressure. Another reason for mercury to be used in a thermometer is because it remains in a liquid state up to 300 degrees Celsius. A clinical thermometer or also known as mercury thermometer is a special instrument which is specifically designed to measure the temperature of our body. A thermometer -- an instrument used to measure air temperature—easily tells us this, but how it tells us is another question entirely. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. It linearly expands as temperature increases. With the strips you stick on you no longer have to worry about any of that. There are three types of clinical thermometers mercury, digital and infrared. 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 … They are also safe, since they can withstand temperature extremes without breaking. If mercury freezes, nitrogen can be caught behind the metal causing the thermometer to stop working. Liquid thermometers were once the most common type in use. This thermometer eliminates any worries about broken glass or mercury hazards. 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. 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-driven thermometers may also be used by meteorologists to measure air temperature. 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. ¤ Alcohol thermometers can be used to measure very low temperatures. 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. 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. I remember they did always remind us to be careful and not to drop them. A laboratory thermometer is recognizable by its long stem with a silver bulb at the end. I remember when I was very little we used a mercury thermometer and my mom always warned us to be very careful with them. Find right answer with solution and explaination of asked question. 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). Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. This is why it can is used to measure body temperature. Historically, mercury thermometers have been used for nearly all temperature measurements because of their accuracy and low cost. These devices weren’t calibrated to a standard scale; they would just make crude or vague assessments.The in… The intended use, nitrogen can be caught behind the metal causing the thermometer is dangerous. Not classified as a thermo electric pyrometer or drinking lab science class ever! In glass to measure higher temperatures cause mercury to be inserted during manufacturing... 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