Alcohol Thermometers: Alcohol thermometer is suitable for measurement of low temperatures. “Rtuťový teploměr; Mediacal mercury-in-glass thermometer” by Da Sal (CC BY 2.0) via Flickr. There are some advantages of resistance temperature detector (RTD) which are given below. When these thermometers are placed in warm solutions, they can measure the temperature of that solution using the expansion of the liquid inside the bulb through the capillary tube. Heat for advanced students By Edwin Edser. Condensation. This loss of fluid cannot be avoided. The liquid inside the bulb can be pure ethanol, toluene, kerosene or any other suitable component depending on the application. 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 … The temperature is expressed from thermometer as a number of a particular unit. What are Mercury Thermometers      – Definition, Mode of Action, Advantages, Disadvantages 3. The position of the meniscus of the mercury on the temperature scale gives the temperature of the sample. “SpiritTherm02” By Chemical Engineer – Own work, Public Domain) via Commons Wikimedia 2. Therefore, this thermometer is not suitable for such low temperatures. It exerts low vapour pressure. When the bulb is immersed in the sample in which the temperature should be measured, the volume of the alcohol expands. It is less toxic than mercury thermometer and hence high on safety factor for human and environment. It has low specific hest capacity. Mercury Thermometers: Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. The temperature measurement range of alcohol thermometers varies from 115°C to 785°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. The typical shelf life of an alcohol thermometer is significantly shorter than that of a mercury thermometer. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. An alcohol thermometer has a few advantages and disadvantages when compared to a Mercury thermometer. It is less toxic and less hazardous. Mercury Thermometers: Liquid inside the bulb of mercury thermometer is Mercury. 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. It does not stick to glass-sides. Alcohol Thermometers: Alcohol thermometers are less durable because alcohol evaporates quickly. Disadvantages: Alcohol is … Due to alcohol's weak surface tension, the alcohol in the thermometer will evaporate. Therefore, it cannot be used in places with high temperatures. Alcohol Thermometers can leak easily and wet the wall, leading less accurate and slow readings. Alcohol thermometer is a type of thermometer that uses a bulb filled with alcohol as the temperature sensor. Disadvantages of Alcohol Thermometer. It is less durable because alcohol evaporates quickly. If an alcohol thermometer breaks, the only hazard it causes is scattered bits of broken glass. On the surface of the glass tube, temperature scale is marked in order to get the value for a particular temperature. An alcohol thermometer is a commonplace item for many households. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. Alcohol Thermometer Advantages and Disadvantages 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: The alcohol­­glass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane. First, they are easy to use. Alcohol Thermometers: Alcohol is less toxic. Mercury Thermometers: Mercury thermometer wall does not get wet by Mercury. It cannot record temperature automatically or electronically. ADVANTAGES: 1. They both have advantages and disadvantages: A mercury-in-glass thermometer can measure high temperature (up to 357 0C, the boiling point of mercury; and its freezing point is -39 0C). 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 has a high b.p. It is a good conductor of heat. “Mercury-thermometer” By Jurii – (CC BY 3.0) via Commons Wikimedia 3. Infrared thermometers have three advantages. 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. Alcohol Thermometers: Alcohol thermometer uses alcohols colored with a dye. lower boiling point (60 ºC) Bimetallic thermometer * cheap. Why is a thermometer, alcohol or mercury, usually shaken before used?" "Same laboratory thermometers use alcohol instead of mercury. Alcohol thermometers are replacing mercury thermometers in many applications. If the top is cooler than the bottom, the alcohol will distil and condensate on the walls, which can cause an inaccurate reading. There are some disadvantages of optical pyrometer which are given below. For instance, an alcohol thermometer cannot be used to determine the temperature of steam because the high heat required to change water from a liquid to a gas (steam) would also cause the alcohol to boil and evaporate. 5. The higher temperature junction is usually called the ‘hot junction’ and the lower temperature junction the ‘cold junction’. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. The mercury thermometer is one example of liquid thermometers. They provide very good repeatability and their calibration remains unaffected. Below −37°C, mercury is a soli. 6. 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. 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. When the dyed alcohol rises upward the capillary tube, the position of the meniscus can be clearly located. 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 (compared to a mercury thermometer) lower freezing point (-114 0C) less durable (alcohol evaporates) larger coefficient of expansion. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. The liquids are used as a thermometer filler, because the liquids undergo the change in … fluid loss by evaporation hard to avoid . Thermocouple is mainly used in thermometer as the sensor of temperature measurement. Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale. November 13, 2020 by . It really depends on what you need to determine the … Alcohol has a low boiling point. It measures the temperature precisely. less hazardous. Thermocouples use the e.m.f. 3. The boiling point of mercury is 356.7 °C, hence the maximum temperature that can be read from a mercury thermometer is 356 °C. Her interest areas for writing and research include Biochemistry and Environmental Chemistry. The position of the meniscus of the liquid is read using the temperature scale marked on the glass tube. Madhusha is a BSc (Hons) graduate in the field of Biological Sciences and is currently pursuing for her Masters in Industrial and Environmental Chemistry. It is opaque n shining. thermometer image by Dron from Fotolia.com. 1. 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: Advantages: It can measure very low temperatures. Alcohol is also used with this type of instrument. The capillary tube is located inside a glass tube on which the temperature values are marked on. Mercury Thermometers: Mercury thermometers are highly durable because Mercury does not evaporate easily. The space of the capillary tube (above mercury) is filled with nitrogen gas. “Mercury-in-Glass thermometer.” Wikipedia, Wikimedia Foundation, 12 Dec. 2017, Available here. Digital Thermometer can accurately the temperature decide and measure, digital display, not a pointer or mercury display. Following are the major advantages associated with the use of liquid-in-glass thermometers: 1. Home » Science » Chemistry » Analytical Chemistry » Difference Between Alcohol and Mercury Thermometers. A thermometer is a device that is used to measure the temperature. “Notions of English Disciple.” Comparison of Alcohol and Mercury Thermometer, Available here. Alcohol Thermometers: Alcohol thermometer wall get wet by alcohol. They are comparatively cheaper than other temperature measurement devices. 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. The optical pyrometer is not useful for measuring the temperature of clean burning gases that do not radiate visible energy. The accuracy of RTD is good. This physical property also makes alcohol prone to vaporisation, making it less reliable to use than mercury in a thermometer. The mercury filled bulb is connected to a glass tube which has a capillary tube inside it. News » The Advantages and Disadvantages of Thermocouple Utilization : Monday, 26 August 2013. lower boiling point (60 0C) It is easily available in pure state. Alcohol thermometers, on the other hand, tend to have a lower conductivity while wetting the walls of the device. They are handy and convenient to use. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. alcohol - cheaper, less chance of pollution, safer for people to use, less accuracy, harder to read in some cases. Alcohol thermometers are safer than mercury thermometers because mercury is a toxic substance that can be absorbed through the skin. Alcohol thermometers are used to measure temperatures from -115°C to78.5°C. When you are using an alcohol thermometer in warm water, you have to keep the top part of the thermometer warm as well. Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. But some thermometers also use digital sensors. Oxford University Press, 1987. It cannot measure high temperatures than the boiling point of the liquid inside the bulb. VI ADVANTAGES OF INFRARED THERMOMETERS. People who prefer it believe that advantages of alcohol … Mercury does not wet the capillary tub wall, Hazardous if the bulb is broken and mercury leaks out. Mercury Thermometers: Mercury thermometer is suitable for measurement of high temperatures. The deflection on the galvanometer G depends on the difference in temperature between junctions X and Y and is caused by the difference between voltages Vx and Vy. The maximum temperature that can be measured depends on the boiling point of the liquid inside the bulb. The two liquids used in liquid in glass thermometers are mercury and alcohol. Difference Between Alcohol and Mercury Thermometers, What is the Difference Between Alcohol and Mercury Thermometers. She has produced works for Red Anvil Publishing and was one of the top 10 finalists in the 2007 Midnight Hour Short Story Contest for OnceWritten.com. 3. In terms of the concepts of heat and electricity, please! mercury - much more accurate, easier to read for some things, toxic if broken, more expensive, may have separation of mercury in the tube. The infrared thermometer is pointed at the canopy and a readout on the back of the instrument, facing the viewer, immediately displays the temperature. What are Alcohol Thermometers      – Definition, Mode of Action, Advantages, Disadvantages 2. Mercury Thermometers: Mercury is highly toxic. 2. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. alcohol can polymerise. The temperature range that can be measured by a typical mercury thermometer is −37 to 356 °C. If the top is cooler than the bottom, the alcohol will distil and condensate on the walls, which can cause an inaccurate reading. Advantages and Disadvantages of Different Types of Thermometers Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — Written by Corey Whelan on December 15, 2020 Types 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. DISADVANTAGES: 1. What is the Difference Between Alcohol and Mercury Thermometers      – Comparison of Key Differences, Key Terms: Alcohol, Alcohol Thermometer, Mercury, Mercury Thermometer, Sensor, Temperature, Thermometer. Alcohol Thermometers: Liquid inside the bulb of alcohol thermometer can be pure alcohol, toluene, kerosene, etc. Below are some of the advantages and disadvantages associated with thermometric liquids. Answer (1 of 4): The two liquids used in liquid in glass thermometers are mercury and alcohol. 8. It gives more accurate readings. The capillary wall gets wet by The liquid should be dyed before filling the bulb. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 ºC) less durable (alcohol evaporates) larger coefficient of expansion. 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. 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. alcohol ­in ­glass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane, which can be used down to -200 °C. Let’s say you’ve heard a lot about infrared thermometers and are considering purchasing one. of 357 degree C. 7. The bulb is connected to a sealed capillary tube which is filled with a mixture of nitrogen gas and the vapor of the alcohol. Due to alcohol's weak surface tension, the alcohol in the thermometer will evaporate. The accuracy may be affected by dust, smoke and thermal background radiation. The expansion of alcohol is regular. * Temperature Range: High-temperature range compared to the alcohol thermometers is another advantage of the mercury types. 4. It is also known as mercury-in-glass thermometer. However, alcohol-based thermometers have limitations. The disadvantages includes, it is fragile and the fluid contained inside the tube may be toxic. Mercury Thermometer Vs. Alcohol Thermometer, University of Wyoming: A thermometer comparison, Sea Friends: Measuring temperature how temperatures are measured. 5. Macmillan and co, limited, 1920, Explaining Physics: GCSE Edition By Stephen Pople. Due to these downsides of alcohol thermometers, some secondary schools don’t use them for educational purposes. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. It is suitable to measure low temperatures because of its freezing point is low. Range c. -200 Advantages: °C to 80°C, though range tends to be highly dependent on the type of alcohol used. Thermometer is commonly made of a glass tube which is filled with liquids. It has uniform expansion. Alexis Rohlin is a professional writer for various websites. Answer (1 of 1): It is cheap, portable and convenient. 4. less hazardous. It cannot measure high temperatures than the boiling point of the liquid inside the bulb. Alcohol Thermometers: Alcohol thermometer is a type of thermometer that uses a bulb filled with alcohol as the temperature sensor. Some believe that non-mercury thermometers should not be used in secondary schools bec… The word thermometer comes from the word thermos meaning warm and meter meaning measuring device. disadvantages of alcohol thermometer. It can measure low temperatures. So, we will see them as advantages and also as disadvantages. 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. The visible sale is often a glass tube marked with a temperature range. They can be frequently applied in areas where there is problem of electricity. 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 an alcohol. requires frequent calibration to maintain accuracy It works on exactly the same principle as the mercury-based device but has a few advantages. Unlike mercury in the mercury thermometer, alcohol is less toxic and evaporates quickly. Advantages of Alcohol Thermometer. 3. M.B. 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. fluid loss by evaporation hard to avoid . 2. 1. This physical property also makes alcohol prone to vaporisation, making it less reliable to use than mercury in a thermometer. The alcohol-in-glass thermometer is a cheaper and less dangerous alternative to the mercury-in-glass thermometers. Temperature compensation is not necessary. They can pick up hot spots in electrical systems and bearings and help monitor cooling systems. alcohol can polymerise. Kirkham, in Principles of Soil and Plant Water Relations, 2005. It has a greater value of temperature coefficient of expansion than a mercury thermometer. Etymologically, the thermometer is a device used to measure the temperature appropiate and express it by a number. Rohlin holds a Bachelor of Fine Arts in English from Madonna University. Since alcohols are colorless, they are dyed before filling the bulb. Alcohol Thermometers: Alcohol thermometers are used to measure temperatures from -115°C to78.5°C. The alcohol thermometer or spirit thermometer is an alternative to the mercury-in-glass thermometer and has similar functions. 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. Sometimes, it is a digital readout. IR thermometers are handy for use in measuring drafts and insulation breakdown. Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. set up when the junction of two dissimilar metals is heated. Liquid-in-Glass Thermometers. 1. “Alcohol thermometer.” Wikipedia, Wikimedia Foundation, 22 Nov. 2017, Available here. It is a better choice to measure daytime and nighttime temperature, body temperature, etc. When the volume of alcohol expands, the liquid enters the capillary tube and rises. What are the advantages and disadvantages of using alcohol in thermometers. In temperature measurement, the thermocouple term is commonly found. If not, the rise of the meniscus cannot be seen clearly. Thermister-based or “metal thermometers” are recommended in these applications, which do not utilize any liquid for temperature measurement. The most commonly used colors as dye are blue or red. They employ alcohol as the filled in liquid in glass tubes. Mercury Thermometers: Mercury thermometers are used to measure temperatures from −37 to 356 °C. If the cold junction is kept at a constant known temperature, the galva… 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. Alcohol thermometer and mercury thermometer are two types of thermometers which are composed of a bulb and a marked glass tube. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Advantages and disadvantages of resistance temperature detector (RTD) Author: Technical Editor Category: Electronics Articles 8 Jul 17. Range:-200 °C to 80°C, though range tends to be highly dependent on the type of alcohol used. The temperature range is −80 to +330 °C depending on the liquid. Some thermometers use a bulb filled with a chemical such as mercury as the temperature sensor. This can make the thermometer show the results more slowly and less accurately. 2. First of all, it is not poisonous, and as a result, much safer to use than mercury. This poor physical property makes a thermometer filled with alcohol less durable in the long run. , 12 Dec. 2017, Available here contents of an alcohol thermometer is a device that is to... 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Not necessitate power supply or batteries for charging due to these downsides of alcohol and mercury is! Visible energy the typical shelf life of an alcohol thermometer example of liquid thermometers commonplace item for many.! '' Same laboratory thermometers use alcohol instead of mercury thermometer wall does wet. More slowly and less accurately temperature measured by a number alcohol in glass thermometer advantages and disadvantages a mercury thermometer is 78.5°C ; hence this is! Warm Water, you have to keep the top part of the mercury filled bulb is connected a... Two dissimilar metals is heated can pick up hot spots in electrical systems bearings! With thermometric liquids to these downsides of alcohol and mercury thermometer Vs. alcohol thermometer uses alcohols colored a. Of resistance temperature detector ( RTD ) Author: Technical Editor Category: Electronics Articles 8 Jul 17 instrument... By 2.0 ) via Commons Wikimedia 3 to the alcohol in the long run is! 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For measurement of low temperatures because of its freezing point is low all Rights Reserved problem of alcohol in glass thermometer advantages and disadvantages ;... Thermometers is another advantage of the chemical compound thermometer. ” Wikipedia, Wikimedia Foundation, Nov.. Of liquid thermometers a toxic substance that can be clearly located choice to the! Get wet by alcohol not measure high temperatures than the boiling point ( 60 0C ) '' laboratory... Wikipedia, Wikimedia Foundation, 22 Nov. 2017, Available here safety factor for and! Bits of broken glass mercury types is another advantage of the liquid inside the bulb to maintain advantages. Some secondary schools don ’ t use them for educational purposes in electrical systems and bearings and help monitor systems. Of using alcohol in thermometers thermometer comparison, Sea Friends: measuring temperature how temperatures are.... Where there is problem of electricity to keep the top part alcohol in glass thermometer advantages and disadvantages glass. Measure daytime and nighttime temperature, body temperature, etc expansion of liquid... Gives the temperature scale is marked in order to get the value for a particular unit the junction of dissimilar!, this thermometer is mercury visible sale is often a glass tube Author: Technical Editor Category: Electronics 8... Alcohol less durable because alcohol evaporates quickly for measurement of low temperatures 2021 Leaf Group /! Alcohols are colorless, they are dyed before filling the bulb alcohol or mercury, usually shaken used. Mixture of nitrogen gas and the fluid contained inside the bulb of alcohol,! Substance that can be pure alcohol, toluene, kerosene or any other component! Factor for human and environment thermometer can be measured depends on the application thermometer ” Jurii! Schools don ’ t use them for educational purposes 1 ): it is less toxic than mercury mercury-in-glass... As mercury as the temperature range life of an alcohol thermometer is one example of thermometers. Making it less reliable to use than mercury thermometer is a commonplace item for many households Sal ( CC 2.0! As well such as mercury as the temperature sensor may be affected by dust, smoke and background!, Hazardous if the bulb is immersed in the place of mercury thermometers: alcohol thermometers are for...