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Gasoline what expansion, also what pressure?

  1. Jul 17, 2009 #1
    Hello,

    Help me work this out please.
    (this is NOT a homework question, I am trying to make a machine)

    I have a metal tube filled with gasoline.

    The tube inside is 1 cm sq x 10 cm in length.

    If I raise the temp of the gas from 20 deg C to 40 deg C, how much gas will spill out of the tube.?

    If the tube was sealed, what pressure would be exerted on the ENDS of the tube?

    Thank you?
     
  2. jcsd
  3. Jul 17, 2009 #2

    berkeman

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    Staff: Mentor

  4. Jul 17, 2009 #3
    Thanks, but that doesn't help me, because I don't understand how to use all those equations. I'm not lazy, just stupid, so I am asking someone to work it out for me please.
     
  5. Jul 17, 2009 #4

    Danger

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    Gold Member

    Welcome to PF, Flantoons.
    Generally speaking 'stupid' and 'gasoline' don't go together very well. (I'm sure that you're not stupid, though; just lacking knowledge.)
    I mean no insult or disrespect. I'm just urging you to exercise caution and keep safety formost. :smile:
     
  6. Jul 17, 2009 #5

    berkeman

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    Can you please tell us the application?
     
  7. Jul 18, 2009 #6
    I was thinking of trying to use expand ice or expanding gasoline to make an engine.

    Here is a sketch of how it works:
    http://www.flantoons.co.uk/no-gas-engine001.jpg

    Questions:
    1. How much does gasoline expand....say from 20 degrees C upwards? (as a liquid)

    2. What pressure does gasoline exert as it expands?

    3. Can I use a better liquid to make my idea work?

    Thank you.
     
  8. Jul 18, 2009 #7

    Danger

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    I still can't help with any numbers, but it appears that you're building basically a modified Sterling engine. Maybe try Googling that to get some ideas.
     
  9. Jul 18, 2009 #8

    negitron

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    Science Advisor

    Yes, any liquid that won't burn your face off if it ignites accidentally. There's a reason gasoline is the primary ingredient in Napalm and it ain't because it smells good in the morning.
     
  10. Jul 18, 2009 #9

    negitron

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    Looking around, it seems ethyl alcohol has one of the higher thermal coefficients of expansion among commonly-available fluids, better even than gasoline.
     
  11. Jul 19, 2009 #10

    Ranger Mike

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    ditto on alcohol for fuel...also love smell of Napalm in the morning...beats the smell of the burning latrines
     
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