ENGPHYS 2NE3 Lecture Notes - Lecture 7: Heat Capacity, Water Vapor, Specific Volume

• School: McMaster University
• Department: Engineering Physics
• Course: ENGPHYS 2NE3
• Professor: David Novog

Document Summary

=(cid:1865)(cid:3046)(cid:3032)(cid:3033: gases under very low density are observed to closely follow this law, good: air, nitrogen, oxygen, helium, hydrogen, carbon dioxide, not good: water, ref 134-a, r specific for each gas. A 1 m3 tank containing air at 25 degrees celsius and 500 kpa is connected through a valve to another tank with 5 kg of air at 35 degrees celsius and 200 kpa. The valve opens and obtains equilibrium at 20 degrees celsius. Determine the volume of the second tank and the pressure (cid:1866) (cid:883):(cid:1874)= (cid:887)(cid:882)(cid:882) (cid:1874)=(cid:882). (cid:884)(cid:890)(cid:889) (cid:4666) (cid:884)(cid:887)+(cid:884)(cid:889)(cid:885). (cid:883)(cid:887)(cid:4667) (cid:1874)(cid:2869)=(cid:882). (cid:883)(cid:889)(cid:883)(cid:883)(cid:886)(cid:1865)(cid:2871) (cid:1866) (cid:884):(cid:1874)= (cid:884)(cid:882)(cid:882) (cid:1874)=(cid:882). (cid:884)(cid:890)(cid:889) (cid:4666)(cid:885)(cid:882)(cid:890). (cid:883)(cid:887)(cid:4667) (cid:1874)(cid:2870)=(cid:882). (cid:886)(cid:886)(cid:884)(cid:884)(cid:1865)(cid:2871) (cid:2870)=(cid:887) (cid:4666) . (cid:886)(cid:886)(cid:884)(cid:884)(cid:4667)=(cid:884). (cid:884)(cid:883) (cid:1865)(cid:2871) Example: water vapor at 200 kpa and 300 degrees celsius is in a piston and allowed to cool under constant pressure until it is a saturated vapor. The piston is allowed to cool until it"s pressure is (cid:1005)(cid:1004)(cid:1004) kpa.