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Thread: Effects Of Heat

  1. #1 Effects Of Heat 
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    Can anybody tell me what would happen to heat in an atmosphere where there is no air?

    What would happen to heat and fire in the same circumstance. Can a fire become established in an environment without air.


    Thank you.


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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    Heat is basically the vibrations of molecules. If something is hotter, the molecules vibrate more. If there were no air, the heat would not be able to be transferred away from the surface by conduction (the collision of hot molecules with cold ones passing on the energy), or convection (the rising of hot molecules and sinking of cold ones in a fluid). It could be transferred by radiation (infra red electromagnetic waves), however. If there was no air, there could be no fire. A fire needs fuel, a heat source and oxygen. No air, no oxygen, no fire.


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    Could a rocket engine fire up in such an environment?
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  5. #4  
    Bullshit Intolerant PhDemon's Avatar
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    Depends on the fuel, rockets do not depend on fire but the ejection of hot gases out the back.
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  6. #5  
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by Aeronaut View Post
    Could a rocket engine fire up in such an environment?
    Rockets carry their own oxidizer. With a liquid fuel rocket, it is contained in a separate tank and mixed with the fuel at the point of combustion. With solid fuel rockets, it is contained in the fuel itself. So rockets provide both their own fuel and oxygen and don't need to have it provided by the environment.
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    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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    In the case of a combustion engine firing up in an atmosphere, what force would it be pushing against?
    Or, as in the lunar module ejecting from the lunar surface, what effects would it have on the ground?

    Can anybody point me to an experiment - Preferably a visual where I can see the effects of a rocket engine in an environment without air.

    Was there advanced knowledge of the lunar atmospheric conditions prior to the moon landing programs?
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  8. #7  
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    Can anybody point me to an experiment - Preferably a visual where I can see the effects of a rocket engine in an environment without air.
    . I am sure you can find many videos of rocket launching.
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  9. #8  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Aeronaut View Post
    In the case of a combustion engine firing up in an atmosphere, what force would it be pushing against?
    It's the reaction to the exhaust being ejected that causes the "push" on the vehicle.
    The same as it does in vacuum.

    Was there advanced knowledge of the lunar atmospheric conditions prior to the moon landing programs?
    Yes.
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    One that can land back on earth. Perhaps?
    https://youtu.be/YHsiQ62EUkQ
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    I did think that. So, the effects of combustion engines work in a non atmospheric pressure the same way as they do in an atmospheric one?

    Can you point me in the direction of details whereby they knew in advance of the lunar conditions?

    Thank you.
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  12. #11  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Aeronaut View Post
    I did think that. So, the effects of combustion engines work in a non atmospheric pressure the same way as they do in an atmospheric one?
    You're being very sloppy here:
    "Combustion engines" covers a wide variety of types (e.g. internal combustion, jet, ramjet etc) most of which do NOT work in a vacuum.
    And what is "a non atmospheric pressure"?
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  13. #12  
    Bullshit Intolerant PhDemon's Avatar
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    Quote Originally Posted by Aeronaut View Post
    Can you point me in the direction of details whereby they knew in advance of the lunar conditions?

    Thank you.
    Basic physics, the moon is too small to retain much of an atmosphere. Gravity and Atmospheres The moon does have a very thin atmosphere but to all practical purposes it is surrounded by a vacuum.
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    Quote Originally Posted by Dywyddyr View Post
    Quote Originally Posted by Aeronaut View Post
    I did think that. So, the effects of combustion engines work in a non atmospheric pressure the same way as they do in an atmospheric one?
    You're being very sloppy here:
    "Combustion engines" covers a wide variety of types (e.g. internal combustion, jet, ramjet etc) most of which do NOT work in a vacuum.
    And what is "a non atmospheric pressure"?
    Indeed there are many types of combustion.

    Were hypergoles used on the lunar capsule?

    By non atmospheric, I refer to the lack of air that would usually sustain a fire or such conditions.
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  15. #14  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Aeronaut View Post
    Were hypergoles used on the lunar capsule?
    The descent engine did use a (throttleable) hypergolic engine.

    By non atmospheric, I refer to the lack of air that would usually sustain a fire or such conditions.
    No atmosphere = no pressure...
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  16. #15  
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    Quote Originally Posted by Dywyddyr View Post
    Quote Originally Posted by Aeronaut View Post
    Were hypergoles used on the lunar capsule?
    The descent engine did use a (throttleable) hypergolic engine.

    By non atmospheric, I refer to the lack of air that would usually sustain a fire or such conditions.
    No atmosphere = no pressure...
    No pressure. No gravity or very minimal amount.
    Does gravity make a person stand upright?

    When driving the moon buggy, were they strapped in. Did they need to be?
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  17. #16  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Aeronaut View Post
    No pressure. No gravity or very minimal amount.
    The two aren't related as such (and 1/6G isn't exactly "minimal").

    Does gravity make a person stand upright?
    Whut?
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  18. #17  
    Bullshit Intolerant PhDemon's Avatar
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    No pressure. No gravity or very minimal amount.
    Incorrect, gravity is caused by the mass of the moon not atmospheric pressure.

    Does gravity make a person stand upright?
    No, that is your muscles, gravity is what makes you fall over.

    When driving the moon buggy, were they strapped in. Did they need to be?
    Yes, gravity and atmospheric pressure are not the only forces acting.

    BTW, judging by the ignorance and lack of knowledge exposed by your questions I'm guessing this is going to spiral into a nutcase "the moon landings were a hoax" thread. Please don't be that guy...
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  19. #18  
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    Quote Originally Posted by PhDemon View Post

    BTW, judging by the ignorance and lack of knowledge exposed by your questions I'm guessing this is going to spiral into a nutcase "the moon landings were a hoax" thread. Please don't be that guy...
    No. I won't. Although some of the statements made in this video raise many questions.

    https://youtu.be/DpPMoIv1lxI
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  20. #19  
    Bullshit Intolerant PhDemon's Avatar
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    Only if you're an idiot...

    Close enough to full retard that I'm done with you...
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  21. #20  
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    Why were all visits to the moon on the same side?
    Didn't anybody want to take a sneaky peek around the back?
    I mean, the moon isn't flat....

    https://ibb.co/cfT6aJ
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  22. #21  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Aeronaut View Post
    Although some of the statements made in this video raise many questions.
    The main question being: are people really that stupid?

    Quote Originally Posted by Aeronaut View Post
    Why were all visits to the moon on the same side?
    Didn't anybody want to take a sneaky peek around the back?
    I mean, the moon isn't flat....
    Landings have been on this face of the Moon, other missions have looked at the far side.
    If a landing were to be on that side then communication wouldn't be possible.
    Simple.
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  23. #22  
    exchemist
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    Quote Originally Posted by PhDemon View Post
    No pressure. No gravity or very minimal amount.
    Incorrect, gravity is caused by the mass of the moon not atmospheric pressure.

    Does gravity make a person stand upright?
    No, that is your muscles, gravity is what makes you fall over.

    When driving the moon buggy, were they strapped in. Did they need to be?
    Yes, gravity and atmospheric pressure are not the only forces acting.

    BTW, judging by the ignorance and lack of knowledge exposed by your questions I'm guessing this is going to spiral into a nutcase "the moon landings were a hoax" thread. Please don't be that guy...
    Aha! well spotted.
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