Chapter23Thefirstlawofthermodynamics23-1Heat:energyintransit(传输)1.“Heatisenergythatflowsbetweenasystemanditsenvironmentbecauseofatemperaturedifferencebetweenthem”WechooseoursignconventionsothatQispositiveinthecasethattheinternalenergyofthesystemtendstobeincreased.Likeotherformsofenergy,heatcanbeexpressedintheSIunitofJoules(J).2.Misconceptions(误解)aboutheatNeitherheatnorworkisanintrinsicpropertyofasystem.Wecannotsaythatasystem“contains”acertainamountofheatorwork.Theyarenotstatefunctions.Bothheatandworkassociatedwitha“thermodynamicprocess”3.TheunderstandingofheatinhistorySee动画库\力学夹\5-03作功与传热23-2Thetransferofheat1.ThermalconductionConside...
