Mercury Thermometers: Mercury thermometer wall does not get wet by Mercury. The bulb is connected to a sealed capillary tube which is filled with a mixture of nitrogen gas and the vapor of the alcohol. The space of the capillary tube (above mercury) is filled with nitrogen gas. 5. 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. Some believe that non-mercury thermometers should not be used in secondary schools bec… Alcohol Thermometers: Alcohol thermometer is a type of thermometer that uses a bulb filled with alcohol as the temperature sensor. What are the advantages and disadvantages of using alcohol in thermometers. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 0C) less durable (alcohol evaporates) larger coefficient of expansion. Answer (1 of 1): It is cheap, portable and convenient. The infrared thermometer is pointed at the canopy and a readout on the back of the instrument, facing the viewer, immediately displays the temperature. It works on exactly the same principle as the mercury-based device but has a few advantages. Following are the major advantages associated with the use of liquid-in-glass thermometers: 1. They provide very good repeatability and their calibration remains unaffected. But some thermometers also use digital sensors. 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. However, alcohol-based thermometers have limitations. thermometer image by Dron from Fotolia.com. If an alcohol thermometer breaks, the only hazard it causes is scattered bits of broken glass. Thermocouples use the e.m.f. 2. It is a good conductor of heat. A thermometer is a device that is used to measure the temperature. Alcohol thermometer and mercury thermometer are two types of thermometers which are composed of a bulb and a marked glass tube. The mercury thermometer is one example of liquid thermometers. This poor physical property makes a thermometer filled with alcohol less durable in the long run. Range:-200 °C to 80°C, though range tends to be highly dependent on the type of alcohol used. 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. ADVANTAGES: 1. Mercury Thermometers: Mercury thermometer is a type of thermometer that uses a bulb filled with mercury as the temperature sensor. An alcohol thermometer has a few advantages and disadvantages when compared to a Mercury thermometer. Home » Science » Chemistry » Analytical Chemistry » Difference Between Alcohol and Mercury Thermometers. It is easily available in pure state. When the dyed alcohol rises upward the capillary tube, the position of the meniscus can be clearly located. Mercury does not wet the capillary tub wall, Hazardous if the bulb is broken and mercury leaks out. 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 … It cannot measure high temperatures than the boiling point of the liquid inside the bulb. The liquids are used as a thermometer filler, because the liquids undergo the change in … 2. 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. First of all, it is not poisonous, and as a result, much safer to use than mercury. “SpiritTherm02” By Chemical Engineer – Own work, Public Domain) via Commons Wikimedia 2. less hazardous. It has a high b.p. Alcohol Thermometers: Alcohol thermometer uses alcohols colored with a dye. “Mercury-thermometer” By Jurii – (CC BY 3.0) via Commons Wikimedia 3. Therefore, this thermometer is not suitable for such low temperatures. Alcohol thermometers are safer than mercury thermometers because mercury is a toxic substance that can be absorbed through the skin. They are comparatively cheaper than other temperature measurement devices. They employ alcohol as the filled in liquid in glass tubes. Answer (1 of 4): The two liquids used in liquid in glass thermometers are mercury and alcohol. 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: Alcohol has a low surface tension and does not react quickly to temperature changes, nor is it a good conductor of heat. Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale. Unlike the mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. It is less toxic and less hazardous. The alcohol thermometer or spirit thermometer is an alternative to the mercury-in-glass thermometer and has similar functions. If not, the rise of the meniscus cannot be seen clearly. The accuracy of RTD is good. So, we will see them as advantages and also as disadvantages. 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. alcohol can polymerise. Mercury Thermometers: Mercury thermometers are used to measure temperatures from −37 to 356 °C. Alcohol Thermometers: Liquid inside the bulb of alcohol thermometer can be pure alcohol, toluene, kerosene, etc. It can measure low temperatures. 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. The accuracy may be affected by dust, smoke and thermal background radiation. The alcohol-in-glass thermometer is a cheaper and less dangerous alternative to the mercury-in-glass thermometers. Alexis Rohlin is a professional writer for various websites. of 357 degree C. 7. The alcoholglass thermometer: As a liquid it utilises ethyl alcohol, toluene and technical pentane. 3. They are handy and convenient to use. The optical pyrometer is not useful for measuring the temperature of clean burning gases that do not radiate visible energy. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 ºC) less durable (alcohol evaporates) larger coefficient of expansion. In temperature measurement, the thermocouple term is commonly found. “Mercury-in-Glass thermometer.” Wikipedia, Wikimedia Foundation, 12 Dec. 2017, Available here. 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. It is also known as mercury-in-glass thermometer. 4. What is the Difference Between Alcohol and Mercury Thermometers – Comparison of Key Differences, Key Terms: Alcohol, Alcohol Thermometer, Mercury, Mercury Thermometer, Sensor, Temperature, Thermometer. 4. The liquid should be dyed before filling the bulb. Infrared thermometers have three advantages. Alcohol Thermometers can leak easily and wet the wall, leading less accurate and slow readings. The expansion of alcohol is regular. Madhusha is a BSc (Hons) graduate in the field of Biological Sciences and is currently pursuing for her Masters in Industrial and Environmental Chemistry. 2. The typical shelf life of an alcohol thermometer is significantly shorter than that of a mercury thermometer. alcohol can polymerise. Alcohol Thermometers: Alcohol thermometers are used to measure temperatures from -115°C to78.5°C. 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. This physical property also makes alcohol prone to vaporisation, making it less reliable to use than mercury in a thermometer. 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