Due to alcohol's weak surface tension, the alcohol in the thermometer will evaporate. Disadvantages: Alcohol is … 3. disadvantages of alcohol thermometer. The capillary wall gets wet by But if the capillary tube is filled with nitrogen gas, then the temperature range can be further increased since nitrogen is an inert gas and the pressure exerted by the gas on the mercury can increase the boiling point of mercury. It is suitable to measure low temperatures because of its freezing point is low. Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. Range:-200 °C to 80°C, though range tends to be highly dependent on the type of alcohol used. Oxford University Press, 1987. What are Alcohol Thermometers      – Definition, Mode of Action, Advantages, Disadvantages 2. “Notions of English Disciple.” Comparison of Alcohol and Mercury Thermometer, Available here. They can be frequently applied in areas where there is problem of electricity. less hazardous. Liquid-in-Glass Thermometers. The liquid inside the bulb can be pure ethanol, toluene, kerosene or any other suitable component depending on the application. Depending on the temperature and also the temperature of distinct substances in special places, divided into kerosene thermometer, alcohol thermometer, mercury thermometer, gas thermometer, resistance thermometer, thermocouple thermometer, radiation thermometer… Alcohol thermometer and mercury thermometer are two types of thermometers which are composed of a bulb and a marked glass tube. The disadvantages includes, it is fragile and the fluid contained inside the tube may be toxic. It really depends on what you need to determine the … It is a good conductor of heat. Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. less hazardous. This capillary tube is made of the same glass used to make the bulb, and it is inside a glass tube which has the temperature scale marked on. The liquids are used as a thermometer filler, because the liquids undergo the change in … Answer (1 of 4): The two liquids used in liquid in glass thermometers are mercury and alcohol. The temperature is expressed from thermometer as a number of a particular unit. Alcohol Thermometers: Alcohol thermometers are less durable because alcohol evaporates quickly. The alcohol-in-glass thermometer is a cheaper and less dangerous alternative to the mercury-in-glass thermometers. Alcohol thermometers are replacing mercury thermometers in many applications. Alcohol Thermometer Advantages and Disadvantages Advantages. Alcohol Thermometers: Alcohol thermometer wall get wet by alcohol. But some thermometers also use digital sensors. * Temperature Range: High-temperature range compared to the alcohol thermometers is another advantage of the mercury types. Mercury Thermometers: Liquid inside the bulb of mercury thermometer is Mercury. The ethanol version is the most widely used due to the low cost and relatively low hazard posed by the liquid in case of breakage. Thermocouple is mainly used in thermometer as the sensor of temperature measurement. Advantages of Alcohol Thermometer. Sometimes, it is a digital readout. M.B. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. They are handy and convenient to use. Mercury Thermometer Vs. Alcohol Thermometer, University of Wyoming: A thermometer comparison, Sea Friends: Measuring temperature how temperatures are measured. The alcohol­­glass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane. Here are some of the different types of thermometers in use today and their advantages: Mercury/alcohol thermometer: The traditional thermometer makes use of mercury or colored alcohol hermetically sealed inside a glass tube. A mercury-in-glass thermometer has a range of -39oC to 360oC while an alcohol-in-glass thermometer has a range of -112o C to 78o C. Noah Borel Here are some advantages and disadvantages of mercury-in-glass thermometers: “Mercury-in-Glass thermometer.” Wikipedia, Wikimedia Foundation, 12 Dec. 2017, Available here. 8. It has uniform expansion. VI ADVANTAGES OF INFRARED THERMOMETERS. alcohol ­in ­glass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane, which can be used down to -200 °C. The accuracy of RTD is good. Below are some of the advantages and disadvantages associated with thermometric liquids. “Alcohol thermometer.” Wikipedia, Wikimedia Foundation, 22 Nov. 2017, Available here. Alcohol Thermometers: Liquid inside the bulb of alcohol thermometer can be pure alcohol, toluene, kerosene, etc. They employ alcohol as the filled in liquid in glass tubes. Answer (1 of 1): It is cheap, portable and convenient. However, alcohol-based thermometers have limitations. It gives more accurate readings. On the surface of the glass tube, temperature scale is marked in order to get the value for a particular temperature. The alcohol thermometer or spirit thermometer is an alternative to the mercury-in-glass thermometer and has similar functions. Etymologically, the thermometer is a device used to measure the temperature appropiate and express it by a number. The temperature range is −80 to +330 °C depending on the liquid. Condensation. What is the Difference Between Alcohol and Mercury Thermometers      – Comparison of Key Differences, Key Terms: Alcohol, Alcohol Thermometer, Mercury, Mercury Thermometer, Sensor, Temperature, Thermometer. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. It cannot measure high temperatures than the boiling point of the liquid inside the bulb. Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale. Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. When the dyed alcohol rises upward the capillary tube, the position of the meniscus can be clearly located. The typical shelf life of an alcohol thermometer is significantly shorter than that of a mercury thermometer. Therefore, this thermometer is not suitable for such low temperatures. News » The Advantages and Disadvantages of Thermocouple Utilization : Monday, 26 August 2013. Below −37°C, mercury is a soli. fluid loss by evaporation hard to avoid . The position of the meniscus of the liquid is read using the temperature scale marked on the glass tube. Because of sensitivity of temperature, high thermal conductivity, low thermal capacity, good visibility and non-wetting of the internal capillary walls of the thermometer, mercury is typically a very accurate gauge of temperature. Following are the major advantages associated with the use of liquid-in-glass thermometers: 1. The two liquids used in liquid in glass thermometers are mercury and alcohol. Alcohol Thermometers: Alcohol thermometer uses alcohols colored with a dye. Mercury Thermometers: Mercury thermometer is suitable for measurement of high temperatures. “Mercury-thermometer” By Jurii – (CC BY 3.0) via Commons Wikimedia 3. Alcohol is also used with this type of instrument. Alcohol has a low boiling point. In terms of the concepts of heat and electricity, please! There are some disadvantages of optical pyrometer which are given below. It is less toxic and less hazardous. It can measure low temperatures. The capillary tube is located inside a glass tube on which the temperature values are marked on. The expansion of alcohol is regular. The major disadvantage of alcohol thermometers is the limited use at very high temperatures as in cooking, because of the low boiling point of the thermometer’s liquid contents. Mercury Thermometers: Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. So, we will see them as advantages and also as disadvantages. 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. It is a better choice to measure daytime and nighttime temperature, body temperature, etc. set up when the junction of two dissimilar metals is heated. Thermister-based or “metal thermometers” are recommended in these applications, which do not utilize any liquid for temperature measurement. The temperature range that can be measured by a typical mercury thermometer is −37 to 356 °C. Difference Between Normal Phase and Reverse Phase... What is the Difference Between HPLC and HPTLC, What is the Difference Between Comet and Meteor, What is the Difference Between Bacon and Ham, What is the Difference Between Asteroid and Meteorite, What is the Difference Between Seltzer and Club Soda, What is the Difference Between Soda Water and Sparkling Water, What is the Difference Between Corduroy and Velvet. It has a high b.p. Alcohol thermometers, on the other hand, tend to have a lower conductivity while wetting the walls of the device. If not, the rise of the meniscus cannot be seen clearly. Why is a thermometer, alcohol or mercury, usually shaken before used?" It exerts low vapour pressure. The accuracy may be affected by dust, smoke and thermal background radiation. The word thermometer comes from the word thermos meaning warm and meter meaning measuring device. Macmillan and co, limited, 1920, Explaining Physics: GCSE Edition By Stephen Pople. alcohol can polymerise. Mercury Thermometers: Mercury thermometers are used to measure temperatures from −37 to 356 °C. The bulb is connected to a sealed capillary tube which is filled with a mixture of nitrogen gas and the vapor of the alcohol. Thermocouples use the e.m.f. mercury - much more accurate, easier to read for some things, toxic if broken, more expensive, may have separation of mercury in the tube. requires frequent calibration to maintain accuracy Alcohol Thermometers: Alcohol is less toxic. This can make the thermometer show the results more slowly and less accurately. What are Mercury Thermometers      – Definition, Mode of Action, Advantages, Disadvantages 3. The infrared thermometer is pointed at the canopy and a readout on the back of the instrument, facing the viewer, immediately displays the temperature. The mercury thermometer is one example of liquid thermometers. Below are some of the advantages and disadvantages associated with thermometric liquids.Advantages of mercury as a thermometric liquid.-It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly.-It does not wet (cling to the sides of) the tube.-It has a high … Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. Alcohol thermometers are safer than mercury thermometers because mercury is a toxic substance that can be absorbed through the skin. Infrared thermometers have three advantages. They provide very good repeatability and their calibration remains unaffected. The maximum temperature that can be measured depends on the boiling point of the liquid inside the bulb. 1. alcohol can polymerise. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. Advantages: It can measure very low temperatures. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. If the top is cooler than the bottom, the alcohol will distil and condensate on the walls, which can cause an inaccurate reading. It works on exactly the same principle as the mercury-based device but has a few advantages. A mercury-in-glass thermometer has a range of -39oC to 360oC while an alcohol-in-glass thermometer has a range of -112o C to 78o C. Noah Borel Here are some advantages and disadvantages of mercury-in-glass thermometers: It is opaque n shining. 5. What are the advantages and disadvantages of using alcohol in thermometers. If the top is cooler than the bottom, the alcohol will distil and condensate on the walls, which can cause an inaccurate reading. It is also known as mercury-in-glass thermometer. Temperature compensation is not necessary. This loss of fluid cannot be avoided. 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