Chapter21Temperature21-1Temperatureandthermalequilibrium1.Thermalequilibrium(a)Adiabatic(绝热)(thermallyinsulating)Fig21-1showstwosystemsAandB,theyareisolatedfromoneanotherandfromtheirenvironment,bywhichwemeanthatneitherenergynormattercanenterorleaveeithersystem.Fig21-1ABATBTForexample,thesystemsmaybesurroundedbywallmadeofthickslabsofstyrofoam(泡沫聚苯乙烯).(b)Diathermic(热透性),meansthermallyconducting(c)ThermalequilibriumWhenthetwosystemareplacedincontactthroughadiathermicwall,thepassageofheatenergythroughthewallcausesthepropertiesoftwosystemtochange.Thechangesgoestountilfinallyallmeasuredpropertiesofeachsystemapproachconstantvalues.Whenthisoccurs,wesay...
