“A maximum thermometer is a unique kind of mercury thermometer which functions by having a constriction in the neck close to the bulb. Condition: Good . Too much liquid, however, would cause the thermometer to react very slow to temperature changes, as the heating of the liquid will take longer and the liquid will take longer to adapt to the outside temperatures to be displayed. A thermometer liquid occupies the whole bulb and partly the capillary. they take up does. A liquid-in-glass thermometer consists of a glass (sometimes quartz) bulb with a glass capillary joined to it. solidification point of – 61.1°C. Volume Thermometer. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. The change in pressure is used to indicate a change in temperature. Various types of mercury-in-glass thermometers are available. The liquid was almost always mercury or coloured alcohol, sealed in a glass tube…. The constant-volume gas thermometer – it contains a gas; when the temperature rises, the pressure increases. A calibrated scale can then be used to read off the respective temperature that led to the corresponding thermal expansion. Liquid in glass thermometers are fragile and for industrial use, the thermometer is mounted in a protective housing and the scale is engraved on a separate plate that is part of the protective case. We suppose that this thermometer uses a liquid, and we define an increase in temperature by the increase in the volume of this liquid. Following are the major advantages associated with the use of liquid-in-glass thermometers: Use of liquid-in-glass thermometers includes following limitations too: There are two major types of Liquid-in-glass thermometers which are mentioned below: This type of thermometer was developed by a German based physicist named Daniel Gabriel Fahrenheit. Planck's law of radiation can be expressed in different forms. Liquid thermometer s were once the most common type in use. Liquid thermometers were once the most common type in use. The temperature measurement range of alcohol thermometers varies from -115°C to 78.5°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. The liquids used in such thermometers must have certain properties in order to be suitable for use. The mercury is forced up through the constriction by the force of expansion as the temperature increases. If the cold junction is kept at a constant known temperature, the galva… Alcohol thermometers are replacing mercury thermometers in many applications. constant pressure gas thermometer. When there is a decrease in the temperature, the column of mercury breaks at the constriction and cannot return to the bulb and will remain stationary in the tube.”. In this thermometer, volume increases directly with the increase in temperature. After the thermometer bulb strikes the paper, catch the thermometer with your other hand to prevent breakage. A typical liquid-in-glass thermometer is shown in the figure below. General use thermometers with various immersion depths at 14", 12" and 7.9" lengths. Thermocouples use the e.m.f. The freezing point of mercury is – 38.83°C at which it gets solidified. set up when the junction of two dissimilar metals is heated. Resetting of the maximum thermometer is a very simple process which just requires the sharp swinging of the thermometer. a calibration point which is most commonly the ice point. 2. Liquid element contained in a glass thermometer may be perilous or risky to health owing to their potential chemical spills. Alcohol, being a volatile substance may result in parting of the column in the thermometer due to mechanical shock. It consists of mercury as a liquid filled in a glass tube. Vapor and Gas Actuated Thermometers, Models VA-(*) and GA-(*), Panel & Surface Mount . 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