第二草气动理论 P=mm2=nEk平=mk7 kE=1krE平=mD3 KTE mL Rt M 2 2kT RT 2PY 8kT 8RT 8PV n M S制 3kT 3RT 3PV第十二章 气体动理论 1 2 2 3 3 k p nm nE nkT = = = v 平 1 3 2 2 2 E m kT k平 = = v 2 m i E RT M = 2 i E kT = 1 2 kT 8 8 8 kT RT PV    m M v = = = 2 2 2 P kT RT PV m M  v = = = 2 3 3 3 kT RT PV m M  v = = = SI制