“Mercury-in-Glass thermometer.” Wikipedia, Wikimedia Foundation, 12 Dec. 2017, Available here. Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. The higher temperature junction is usually called the ‘hot junction’ and the lower temperature junction the ‘cold junction’. First, they are easy to use. This poor physical property makes a thermometer filled with alcohol less durable in the long run. Liquid-in-Glass Thermometers. 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 and disadvantages of resistance temperature detector (RTD) Author: Technical Editor Category: Electronics Articles 8 Jul 17. 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. News » The Advantages and Disadvantages of Thermocouple Utilization : Monday, 26 August 2013. 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. Alcohol thermometers are used in the place of mercury thermometers considering the safety of the chemical compound. Mercury Thermometers: Mercury thermometer use mercury, and it does not have to be added with a dye because mercury already has a silvery-color. 6. 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: Below are some of the advantages and disadvantages associated with thermometric liquids. Since alcohols are colorless, they are dyed before filling the bulb. It is a good conductor of heat. Alcohol thermometers are replacing mercury thermometers in many applications. fluid loss by evaporation hard to avoid . The accuracy of RTD is good. Mercury Thermometers: Mercury thermometer is suitable for measurement of high temperatures. 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. Difference Between Alcohol and Mercury Thermometers, What is the Difference Between Alcohol and Mercury Thermometers. 4. So, we will see them as advantages and also as disadvantages. They can pick up hot spots in electrical systems and bearings and help monitor cooling systems. 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. It is less durable because alcohol evaporates quickly. If not, the rise of the meniscus cannot be seen clearly. 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. It is also known as mercury-in-glass thermometer. On the surface of the glass tube, temperature scale is marked in order to get the value for a particular temperature. 4. 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. Alcohol has a low boiling point. The capillary tube is located inside a glass tube on which the temperature values are marked on. 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. Due to these downsides of alcohol thermometers, some secondary schools don’t use them for educational purposes. It really depends on what you need to determine the … It cannot record temperature automatically or electronically. Some thermometers use a bulb filled with a chemical such as mercury as the temperature sensor. 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. Sometimes, it is a digital readout. It gives more accurate readings. The two liquids used in liquid in glass thermometers are mercury and alcohol. alcohol can polymerise. Alcohol thermometers are used to measure temperatures from -115°C to78.5°C. Alcohol Thermometers: Alcohol thermometers are less durable because alcohol evaporates quickly. lower boiling point (60 ºC) Bimetallic thermometer * cheap. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 ºC) less durable (alcohol evaporates) larger coefficient of expansion. Alcohol is also used with this type of instrument. The alcohol-in-glass thermometer is a cheaper and less dangerous alternative to the mercury-in-glass thermometers. The temperature is expressed from thermometer as a number of a particular unit. It is a better choice to measure daytime and nighttime temperature, body temperature, etc. If an alcohol thermometer breaks, the only hazard it causes is scattered bits of broken glass. The expansion of alcohol is regular. They are handy and convenient to use. Advantages of Alcohol Thermometer. The optical pyrometer is not useful for measuring the temperature of clean burning gases that do not radiate visible energy. Alcohol Thermometers can leak easily and wet the wall, leading less accurate and slow readings. If the cold junction is kept at a constant known temperature, the galva… It is less toxic and less hazardous. Answer (1 of 4): The two liquids used in liquid in glass thermometers are mercury and alcohol. less hazardous. 1. The position of the meniscus of the liquid is read using the temperature scale marked on the glass tube. Therefore, it cannot be used in places with high temperatures. Alcohol Thermometers: Alcohol thermometer wall get wet by alcohol. Alcohol thermometers, on the other hand, tend to have a lower conductivity while wetting the walls of the device. Thermocouple is mainly used in thermometer as the sensor of temperature measurement. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. 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 most commonly used colors as dye are blue or red. Alexis Rohlin is a professional writer for various websites. This physical property also makes alcohol prone to vaporisation, making it less reliable to use than mercury in a thermometer. 3. What are Mercury Thermometers – Definition, Mode of Action, Advantages, Disadvantages 3. Macmillan and co, limited, 1920, Explaining Physics: GCSE Edition By Stephen Pople. 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. Alcohol Thermometers: Alcohol is less toxic. There are some advantages of resistance temperature detector (RTD) which are given below. Range:-200 °C to 80°C, though range tends to be highly dependent on the type of alcohol used. 1. The word thermometer comes from the word thermos meaning warm and meter meaning measuring device. 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. It does not stick to glass-sides. thermometer image by Dron from Fotolia.com. First of all, it is not poisonous, and as a result, much safer to use than mercury. 2. The accuracy may be affected by dust, smoke and thermal background radiation. * Temperature Range: High-temperature range compared to the alcohol thermometers is another advantage of the mercury types. The liquid inside the bulb can be pure ethanol, toluene, kerosene or any other suitable component depending on the application. 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. Mercury Thermometers: Liquid inside the bulb of mercury thermometer is Mercury. Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale. 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. People who prefer it believe that advantages of alcohol … Alcohol Thermometers: Alcohol thermometer is a type of thermometer that uses a bulb filled with alcohol as the temperature sensor. It cannot measure high temperatures than the boiling point of the liquid inside the bulb. Thermometer is commonly made of a glass tube which is filled with liquids. 5. When the volume of alcohol expands, the liquid enters the capillary tube and rises. “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. Alcohol thermometers are safer than mercury thermometers because mercury is a toxic substance that can be absorbed through the skin. 3. There are some disadvantages of optical pyrometer which are given below. But the maximum temperature measured by an alcohol thermometer is 78.5°C; hence this thermometer is suitable for measuring lower temperatures. "Same laboratory thermometers use alcohol instead of mercury. Range c. -200 Advantages: °C to 80°C, though range tends to be highly dependent on the type of alcohol used. In temperature measurement, the thermocouple term is commonly found. The bulb is connected to a sealed capillary tube which is filled with a mixture of nitrogen gas and the vapor of the alcohol. Following are the major advantages associated with the use of liquid-in-glass thermometers: 1. The infrared thermometer is pointed at the canopy and a readout on the back of the instrument, facing the viewer, immediately displays the temperature. Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. The visible sale is often a glass tube marked with a temperature range. Disadvantages: Alcohol is … A thermometer is a device that is used to measure the temperature. Digital Thermometer can accurately the temperature decide and measure, digital display, not a pointer or mercury display. The temperature range that can be measured by a typical mercury thermometer is −37 to 356 °C. What are the advantages and disadvantages of using alcohol in thermometers. Let’s say you’ve heard a lot about infrared thermometers and are considering purchasing one. Therefore, this thermometer is not suitable for such low temperatures. Mercury Thermometers: Mercury thermometers are used to measure temperatures from −37 to 356 °C.
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