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1、AirConditioning
Airconditioningcontrolsthetemperature,moisture,cleanliness,andmovementofindoorair.Itcoolstheairwhentheweatherishot.Itwarmstheairwhentheweatheriscold.Comfortdependspartlyonhumidity,andairconditioningremovesmoisturefromtheairoraddsitasneeded.Rem
2、ovingdirtanddustfromairmakestheairmorehealthful.Bycontrollingairmovement,airconditioningbringsfreshairintoaroomandpushesoutstaleair.Inalltheseways,airconditioningprovidesairthatmakespeoplecomfortableatwork,atplay,andwhilesleeping.HowweuseairconditioningForcom
3、fort.Whentheweatherishot,mostpeopleenjoyeatingincool,air-conditionedrestaurants.Theysleepbetterinair-conditionedbedrooms.Airplanes,trains,ships,buses,andautomobilesthatareairconditionedmaketravelingmorepleasant.Airconditioninghelpskeephomescleanbytakingdirtfr
4、omtheair.Itoftenrelievesthediscomfortofhay-fevervictims,becauseitremovespollenfromtheair.Air-conditionedhospitalsprotectthehealthandimprovethecomfortofpatientsandhospitalstaffs.Duringcoldweather,airconditioningperformsmuchthesameservices.Itsuppliesclean,moist
5、airthatiswarmedtothemostcomfortabletemperaturesforworkingandsleeping.Inbusinessandindustry,airconditioningimprovestheefficiencyofworkers.Employeesstaymorealertandbecomelesstiredinair-conditionedofficesandfactories.Theymakefewermistakesandhavefeweraccidents.Ai
6、rconditioningalsoprotectsworkersagainsthightemperaturesandharmfuldust,smoke,andfumes.Instoresandshops,airconditioningkeepsmerchandiseclean.Italsoincreasessales,becausepeopleliketoshopincomfort.Severalindustries,suchastheelectronicsindustry,workwithdelicatepar
7、tsandthereforerequireair-conditionedcleanrooms,whicharefreeofdustorgerms.Companiesintheseindustriesmakeorassembleequipmentinsuchroomsbecausethetiniestspeckofdustcouldpreventtheequipmentfromworkingproperly.Largecomputersbecomewarmwheninuseandaresensitivetodust
8、.Acomputermaybreakdownunlessairconditioningremovesthisheatandkeepsthesurroundingairclean.Metalsandothermaterialsexpandasthetemperaturerises,andcontractasthetemperaturedrops.Forthisreason,
