6. It is a better choice to measure daytime and nighttime temperature, body temperature, etc. First of all, it is not poisonous, and as a result, much safer to use than mercury. Alcohol thermometers are used to measure temperatures from -115°C to78.5°C. It has a high b.p. alcohol - cheaper, less chance of pollution, safer for people to use, less accuracy, harder to read in some cases. alcohol in glass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane, which can be used down to -200 °C. 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. First, they are easy to use. The mercury thermometer is one example of liquid thermometers. 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. Sometimes, it is a digital readout. People who prefer it believe that advantages of alcohol … The maximum temperature that can be measured depends on the boiling point of the liquid inside the bulb. Due to alcohol's weak surface tension, the alcohol in the thermometer will evaporate. 5. There are some advantages of resistance temperature detector (RTD) which are given below. 3. When the bulb is immersed in the sample in which the temperature should be measured, the mercury rises up the capillary tube due to the expansion of the volume as a response to the change in temperature. Thermocouples use the e.m.f. The space of the capillary tube (above mercury) is filled with nitrogen gas. Therefore, this thermometer is not suitable for such low temperatures. Answer (1 of 4): The two liquids used in liquid in glass thermometers are mercury and alcohol. Kirkham, in Principles of Soil and Plant Water Relations, 2005. What are the advantages and disadvantages of using alcohol in thermometers. IR thermometers are handy for use in measuring drafts and insulation breakdown. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. less hazardous. The capillary tube is located inside a glass tube on which the temperature values are marked on. Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. A thermometer is composed of two components: a sensor to detect temperature, and a visible scale to get the numerical value for the temperature measured. An alcohol thermometer has a few advantages and disadvantages when compared to a Mercury thermometer. Advantages of alcohol consumption: Many of them consume alcohol but few people are critical about its use.But some of them are in dilemma about its use. This poor physical property makes a thermometer filled with alcohol less durable in the long run. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. M.B. lower boiling point (60 0C) The optical pyrometer is not useful for measuring the temperature of clean burning gases that do not radiate visible energy. set up when the junction of two dissimilar metals is heated. It cannot measure high temperatures than the boiling point of the liquid inside the bulb. less hazardous. Disadvantages: Alcohol is … 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. The temperature range is −80 to +330 °C depending on the liquid. Madhusha is a BSc (Hons) graduate in the field of Biological Sciences and is currently pursuing for her Masters in Industrial and Environmental Chemistry. The visible sale is often a glass tube marked with a temperature range. “Mercury-in-Glass thermometer.” Wikipedia, Wikimedia Foundation, 12 Dec. 2017, Available here. They can pick up hot spots in electrical systems and bearings and help monitor cooling systems. Thermister-based or “metal thermometers” are recommended in these applications, which do not utilize any liquid for temperature measurement. “Rtuťový teploměr; Mediacal mercury-in-glass thermometer” by Da Sal (CC BY 2.0) via Flickr. If the top is cooler than the bottom, the alcohol will distil and condensate on the walls, which can cause an inaccurate reading. ADVANTAGES: 1. 3. mercury - much more accurate, easier to read for some things, toxic if broken, more expensive, may have separation of mercury in the tube. The main difference between alcohol and mercury thermometer is that the bulb of mercury thermometer is filled with mercury whereas the bulb of alcohol thermometer is filled with alcohol. Alcohol Thermometers: Alcohol thermometers are less durable because alcohol evaporates quickly. It gives more accurate readings. The boiling point of mercury is 356.7 °C, hence the maximum temperature that can be read from a mercury thermometer is 356 °C. The word thermometer comes from the word thermos meaning warm and meter meaning measuring device. Oxford University Press, 1987. They are comparatively cheaper than other temperature measurement devices. It is a good conductor of heat. The alcohol-in-glass thermometer is a cheaper and less dangerous alternative to the mercury-in-glass thermometers. disadvantages of alcohol thermometer. Alcohol Thermometers: Alcohol thermometer uses alcohols colored with a dye. 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… 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. Condensation. When the volume of alcohol expands, the liquid enters the capillary tube and rises. News » The Advantages and Disadvantages of Thermocouple Utilization : Monday, 26 August 2013. Therefore, it cannot be used in places with high temperatures. The higher temperature junction is usually called the ‘hot junction’ and the lower temperature junction the ‘cold junction’. Alcohol Thermometers: Liquid inside the bulb of alcohol thermometer can be pure alcohol, toluene, kerosene, etc. Some thermometers use a bulb filled with a chemical such as mercury as the temperature sensor. 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