Laboratory thermometers:They are used to measure temperatures or temperaturechangeswithahighdegreeofprecision.Theyaremadeofmetalorglassandstrengthenedthroughprocessessuchasthermaltemperingorannealing.For example, liquid-in-glassthermometersaremadeofsealedglassandcontainafluid,usuallymercuryorredcolouredalcohol,whosevolumechangesrelativelytoitstemperature.Bimetallicstripthermometersincludetwodifferentmetalsthatarebondedtogetherandexpandatdifferentratesastheywarmup.Longbimetallicstripsarewoundintoacoilandusedwithadial. Clinicalthermometer: It isdesigned forclinicaluse inhumansoranimals.Itismadeofafinecapillarywithabulbfilledwithmercuryatoneend.Nearthebulb,ithasanarrowbendknownasconstriction.Beforeuse,thethermometerisjerkedsothatthemercuryflowsbackintothebulb.
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Importance of Laboratory Thermometer
The range of a laboratory thermometer is generally from 10C to 110C. Hence it is not used for measuring body temperature. Importance of laboratory thermometer:
Laboratory thermometers are designed small to make it potable.
Bulb of laboratory thermometer is usually larger than its bore in order to contain more liquid, to improve its sensitivity.That's why its more precise as even a small change in temperature will make the liquid to rise in the capillary tube.