brianmay27 Posted December 5, 2007 Share Posted December 5, 2007 Ok this one has been getting me, Does the tempature of a gas change if the presure is changed? I could sware i heard it many times before but my chem teacher says that it does not. some one cair to explain Link to comment Share on other sites More sharing options...
YT2095 Posted December 5, 2007 Share Posted December 5, 2007 ask your teacher how the principal behind a Diesel engine works the top sentence here: http://en.wikipedia.org/wiki/Gas_compressor this May help too: http://en.wikipedia.org/wiki/Heat_of_vaporization Link to comment Share on other sites More sharing options...
swansont Posted December 5, 2007 Share Posted December 5, 2007 In an isothermal expansion, no. But that's a specific case. Point your chem teacher to the ideal gas law, PV=nRT and ask what can change if volume is held constant. Link to comment Share on other sites More sharing options...
YT2095 Posted December 5, 2007 Share Posted December 5, 2007 this is good too: http://en.wikipedia.org/wiki/Entropy and a chem teacher is required to teach this also. Link to comment Share on other sites More sharing options...
insane_alien Posted December 5, 2007 Share Posted December 5, 2007 a chemistry teacher not familiar with the ideal gas law? somethings up there. sure he's not just a biology teacher drafted in to cover a shortage? Link to comment Share on other sites More sharing options...
brianmay27 Posted December 11, 2007 Author Share Posted December 11, 2007 ok well after talking to him i guess i missed a big part. in the lab we did the volume changed... so we had a plunger and we pushed it to different volumes and the pressure increased that way, at the time i guess it did not mater. guess it did anyway. Link to comment Share on other sites More sharing options...
Fable Posted December 23, 2007 Share Posted December 23, 2007 maybe your teacher tryed to explain the coolant systems in simple words, maybe too simple for you get it right? Link to comment Share on other sites More sharing options...
Riogho Posted December 26, 2007 Share Posted December 26, 2007 Okay, consider having a gas inside of a piston. Suppose that the piston moves inward, so that the atoms aer slowly compressed into a smaller space. What happpens when an atom hits the moving piston? Evidentily it picks up speed from the collision. You can try it by boucning a ping-pong ball from a forward-movin paddle. An atoms happens to be standing still adn ths piston hits it, it will surely move. So the atoms are 'hotter' when they come away from the piston then they were befroe they struck it. Therefore all the atoms which are in the vessel will have picked up speed. This means that, when we compress a gagas slowly, the temeprature will increase. So under slow compression a gas will increase in tremperature, and under slow expansion it will decrease in temperature. Link to comment Share on other sites More sharing options...
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