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A question about heat, rephrased.
I already posted a question about heat asking how heat travels through
a vacuum, but everybody assumed I was talking about starlight and I therefore got a bunch of responses relating to photons and electromagnetic waves. So allow me to rephrase... If an astronaut removes his helmet in space, what happens to his body heat considering heat does not travel through a vacuum? |
#2
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On Sat, 02 Oct 2004 22:54:04 -0700, Shadowmega wrote:
I already posted a question about heat asking how heat travels through a vacuum, but everybody assumed I was talking about starlight and I therefore got a bunch of responses relating to photons and electromagnetic waves. So allow me to rephrase... Maybe that is because that's the correct answer If an astronaut removes his helmet in space, what happens to his body heat considering heat does not travel through a vacuum? His body will radiate the heat, in the form of black body radiation. The "main" wavelength will increase as his body's temperature decreases. If he is not near a star, eventually his body should cool to the same temperature as the cosmic background. -- http://www.offshoreexecutive.com/ Offshore The Boss! |
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Shadowmega wrote:
I already posted a question about heat asking how heat travels through a vacuum, but everybody assumed I was talking about starlight and I therefore got a bunch of responses relating to photons and electromagnetic waves. So allow me to rephrase... If an astronaut removes his helmet in space, what happens to his body heat considering heat does not travel through a vacuum? Heat travels through vacuum just fine. -- Sander +++ Out of cheese error +++ |
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the astronaut in question is flash frozen, his blood freeze dried
instantly, assuming the astronaut in question didn't explode immediately from the air pressure difference. This is not a really fun experiment. Don't try this at home, kids. The reason heat does not travel easily through a vaccuum is because heat is kinetic energy, which operates at a much higher collective density per cubic environment variable than in outer space. Consider the fact that in outer space, the closest atoms are together is about a meter apart, no accounting for dust and debris say in a ring like around Saturn or an asteroid belt, whereas on Earth the atoms are much closer together, say anywhere from a nanometer on up(that's 1/1,000,000 of one meter). You can feel heat on earth because there are more atoms to transmit heat than there are in space. Got it? Good. Since kinetic energy is an active force, the less there is around it to support the force exerted, the less force can be exerted and the more force must be exerted to maintain equilibrium. It is a recursively dynamic equation bearing on that which can be used efficiently for kinetic support grounded to the base state of consumption rate needed to maintain the ground state. Is your question leading somewhere? Shadowmega wrote: I already posted a question about heat asking how heat travels through a vacuum, but everybody assumed I was talking about starlight and I therefore got a bunch of responses relating to photons and electromagnetic waves. So allow me to rephrase... If an astronaut removes his helmet in space, what happens to his body heat considering heat does not travel through a vacuum? |
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Rearranged reply to correct some top posting:
Craig Secrist wrote: Shadowmega wrote: I already posted a question about heat asking how heat travels through a vacuum, but everybody assumed I was talking about starlight and I therefore got a bunch of responses relating to photons and electromagnetic waves. So allow me to rephrase... If an astronaut removes his helmet in space, what happens to his body heat considering heat does not travel through a vacuum? the astronaut in question is flash frozen, his blood freeze dried instantly, assuming the astronaut in question didn't explode immediately from the air pressure difference. This is not a really fun experiment. Don't try this at home, kids. No, he is not flash frozen. If we disregard any effects due to the air pressure difference his temperature might degrade because he is radiating heat into deep space (assuming the head is in shadow, if it is in sunlight in earth orbit it will be heated and get a very quick tan!) The reason heat does not travel easily through a vaccuum is because heat is kinetic energy, which operates at a much higher collective density per cubic environment variable than in outer space. Consider the fact that in outer space, the closest atoms are together is about a meter apart, no accounting for dust and debris say in a ring like around Saturn or an asteroid belt, whereas on Earth the atoms are much closer together, say anywhere from a nanometer on up(that's 1/1,000,000 of one meter). You can feel heat on earth because there are more atoms to transmit heat than there are in space. Got it? Good. Since kinetic energy is an active force, the less there is around it to support the force exerted, the less force can be exerted and the more force must be exerted to maintain equilibrium. It is a recursively dynamic equation bearing on that which can be used efficiently for kinetic support grounded to the base state of consumption rate needed to maintain the ground state. Here you are are making a big mistake, heat is not just kinetic energy, it is also photon energy, just use the Planck Law and you'll find out how much heat exchange there is with the environment (3 K if radiating into deep space) -- th |
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