Types of Thermometer

Different types of thermometers Galileo thermometer. AGalileo thermometer(orGalilean thermometer), named after Italian physicistGalileo Galilei, is athermometermade of a sealedglass cylindercontaining a clearliquidand a series of objects whose densities are such that they jump off or fall as the temperature changes. By definition, Galileos thermometer is actually a thermoscope, not a thermometer. Gas thermometer A splosh thermometermeasurestemperatureby the variation in flashiness or pressure of a bobble.One common apparatus is a constant volume thermometer. It consists of a bulb connected by acapillary tubeto amanometer. The bulb 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, known as Charless Law. The pressure of the gas in the bulb sight be obtained by measuring the level difference in the two arms of the manometer. Gas thermometers are a great deal used to calibrate otherthermometers. Alcohol ther mometerTheAlcohol thermometeror look thermometeris an alternative to the quicksilver-in-glass thermometer, and functions in a similar way. But unlike atomic number 80-in-glass thermometer, the confine of an alcohol thermometer are less toxic and will evaporate outdoor(a) fairly quickly. For the working temperature range, themeniscusor interface between the liquid is inwardly the capillary. With increasing temperature, the volume of liquid expands and themeniscusmoves up the capillary. The position of themeniscusshows the temperature against an carve 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 ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and itsemis sivity, the objects temperature can be determined most of the time. Mercury thermometer A quicksilver-in-glass thermometer, is athermometerconsisting ofmercuryin aglasstube.Calibrated marks on the tube take on thetemperatureto be read by the length of the mercury within the tube, which varies (nearly linearly) consort 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 expansion and contraction of this volume of mercury is then amplified in the much narrower bore of the tube. The space above the mercury may be filled withnitrogenor it may be less than atmospheric pressure, which is normally known as avacuum.