Types of Thermometer

Different types of thermometers Galileo thermometer. AGalileo thermometer(orGalilean thermometer), named after Italian physicistGalileo Galilei, is athermometermade of a plasteredglass cylindercontaining a clearliquidand a serial publication of objects whose densities are such that they rise or fall as the temperature changes. By definition, Galileos thermometer is actually a thermoscope, not a thermometer. Gas thermometer A gaseous state thermometermeasurestemperatureby the variation in volume or pressure of a gas.One common apparatus is a constant volume thermometer. It consists of a medulla oblongata connected by acapillary tubeto amanometer. The myeline is filled with a gas such that the volume of the gas in the bulb remains constant. The volume is related to temperature by k, cognise as Charless Law. The pressure of the gas in the bulb can be obtained by measuring the level difference in the two build up of the manometer. Gas thermometers are often utilize to calibrate oth erthermometers. in harmfulant thermometerTheAlcohol thermometerorspirit thermometeris an alternative to themercury-in-glass thermometer, and functions in a homogeneous way. But unlike mercury-in-glass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate away fairly quickly. For the working temperature range, the semilunar cartilageor interface between the liquid is within the capillary. With increasing temperature, the volume of liquid expands and themeniscusmoves up the capillary. The position of themeniscusshows the temperature against an inscribed scale. Infrared thermometerInfrared thermometersinfertemperatureusing a portion of thethermal radiationsometimes calledblackbody radiationemitted by the object of measurement. Theyre sometimes calledlaser thermometersif alaseris used to help aim the thermometer, ornon-contact thermometersto describe the devices superpower to measure temperature from a distance. By knowing the amount of infrared forc e emitted by the object and itsemissivity, the objects temperature can be determined most of the time. hectogram thermometer Amercury-in-glass thermometer, is athermometerconsisting ofmercuryin aglasstube.Calibrated tag on the tube allow thetemperatureto be read by the length of the mercury within the tube, which varies (nearly linearly) according to the temperature of the mercury. To increase the sensitivity, there is usually a bulb of mercury at the end of the thermometer which contains most of the mercury elaboration and contraction of this volume of mercury is then amplified in the much narrower tire of the tube. The space above the mercury may be filled with northor it may be less than atmospheric pressure, which is normally known as avacuum.