One of the first distinctions needed when talking about types of thermometers is form of measurement. Older thermometers of this type used liquid mercury. Do you know where or how these devices are used? Question and Answer forum for K12 Students. Thermometers: • Body temperature is a measurement of the amount of heat in the body. 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Thermometric Properties: The following are some essential conditions governing choice of properties and materials for temperature measurement by the thermometer. They can be used literally anywhere as their uses are quite diverse. Expansion of gases: (a) Gas thermometers. For example, there is one set of thermometers that are used to measure body temperature while another set of thermometers to measure boiling point and freezing point during experiments. Choosing the right one for your need. This type is also known as a pressure-filled or vapour-pressure thermometer. The following is the mechanism of operation for liquid-in-glass thermometers: As the temperature around the bulb heats up, the liquid rises in the glass tube. Infrared thermometers are one the go-to types of thermometer for non-contact measurement. Save my name, email, and website in this browser for the next time I comment. There are different types of thermometers such as a medicalor clinical thermometer, which is used to measure somebody’s body temperature. All of the ones we have mentioned above require contact to determine temperature. For example, if you measure the temperature of the air outside, you will know how to dress appropriately. They can be found in many household appliances like stoves. Instead of using liquids or gases paired with a temperature scale, they have a digital screen which can show you the readings in mere seconds. Temperature strips are fast, but they are not the most reliable. The strip is sensitive to change in temperature, and it causes mechanical displacement, which is used to determine the temperature. The change in pressure is used to indicate a change in … What physical property do they use to measure temperature? When paired with a temperature scale, it is possible to use this occurrence to determine the temperature. You can measure the temperature of many things to get useful information about your surroundings and yourself. In this thermometer, the length of a mercury column from some fixed point is taken as thermometric property. A gardener might use a weather thermometerto give the outdoor temperature. Digital thermometers. Understanding how different thermometers work will help you to find a thermometer that will be most suitable for your needs. (iii) Platinum resistance thermometer: Based on how they work, there are 6 types: That is it for our classification of the different types of thermometers. Maximum minimum thermometer. Here we shall look into the different types of thermometers available, which not only give accurate readings but are also very easy to use. Thermometers can be classified according to the nature of substance which expands. It all depends on the type of thermometer. They are fast, accurate and convenient. Types of Thermometer. Types of thermometers 1. This type is also known as a pressure-filled or vapour-pressure thermometer. Schedule a Free Physics … Types of Thermometer 1. For constant pressure gas thermometers, t = \(\frac{V_{t}-V_{0}}{V_{100}-V_{0}}\) x 100°C. By . The non-contact feature makes them the best tool for measuring extremely high or low surface temperatures. Some benefits of infrared thermometers are: All of the types we mentioned in this section can be used for different purposes: industry, science, cooking, or medical purposes. One … Some different types of thermometers are given below. When it is cold, the liquid will contract and fall in the tube. A gas thermometer can be filled with any gas, but the most popular option is hydrogen. These liquid thermometers are based on the principal of thermal expansion. A digital thermometer has a thermistor that reacts to the change in temperature and projects the result on the device's screen. Each colour corresponds with a certain body temperature. Classical Physics and Modern Physics are two Major Types of Physics. Summary Three types of thermometers are alcohol, liquid crystal, and infrared radiation (pyrometer). ... there are several types of thermometers used in different sectors, including automobiles, healthcare, technology, scientific research, etc. opague; is a metal and therfore a good heat conductor; does not stick to glass - convex meniscus Then, t = \(\left(\frac{R_{t}-R_{0}}{R_{100}-R_{0}} \times 100\right)\)°C = \(\left(\frac{R_{t}}{R_{t r}} \times 273.16\right)\)K, Here, temperature coefficient of resistance (α) is given by, α = \(\frac{R_{100}-R_{0}}{R_{0} \times 100}\). As we discussed, the main use of any thermometer is to measure and indicate … These strips contain liquid crystals that react to heat by changing colour. Unit 2 Thermal physics. With the help of oral, rectal and armpit digital thermometers, you can get your results in seconds. Fahrenheit and Celsius might be displayed on a thermometer. • The normal adult body temperature is 37 degrees Celsius. 3. If p0, P100 and pt are the pressures of gas at temperatures 0° C, 100°C, and unknown temperature (t°C) respectively keeping the volume constant, then, t = \(\left(\frac{p_{t}-p_{0}}{p_{100}-p_{0}} \times 100\right)\)°C, Note: An infrared thermometer uses thermal radiation that objects emit to measure temperature. Liquid-in-glass. Note: You can visit UY1: Measurement Of Temperature for a in-depth review of the different types of thermometers. Scientists and doctors have created a wide variety of thermometer which can be used to measure the body temperature. This type is mostly used to determine a person’s temperature through their ear. Mercury in clinical thermometers contract when in contact with coldness and expand when in contact with heat. It was not … The … Laboratory thermometer is used to measure the temperature of things other than human body. Different Types of Thermometers: Although temperature strips are not thermometers per se, they are often used in hospitals as a way of quickly determining a patient’s temperature. When the thermometer’s temperature increases, the liquid from the bulb is forced into the narrow tube, producing a large change in the length of the column for a small … Here is how to use thermometers: These devices are used wherever there is a need to measure temperature, for example: These are not the only places where these devices come in handy. It states the amount of heat lost by the body is the amount of heat gained by its surrounding. Different Types Of Thermometers The Liquid in Glass Thermometer: We have already seen that two types of liquid used for thermometer one is known as alcohol and other is mercury. The Physics A liquid in glass thermometer uses the thermal expansion of a liquid to measure temperature. Thermometry and Calorimetry: However, both of these liquid-filled thermometers require some time to show the temperature. When a substance gets hotter, it expands to a greater volume. A room thermometerwould be used to take the indoor temperature of a room. The thermodynamic temperature scale One of the difficulties in the accurate measurement of temperature is that the various types of thermometer, e.g., mercury-in-glass, platinum resistance, therm electric, and so on give different readings when used to measure the same temperature, because the value obtained depends on the properties of the substance used in the thermometer. This is a mechanic type that works with a bimetal strip. ... 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