Nnanji
Posts: 4552
Joined: 3/29/2016 Status: offline
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quote:
ORIGINAL: epiphiny43 In positive gravity the heat of a flame heats All gasses nearby, N2, remaining O2, and the various combustion products. These all Rise, by Boyle's gas law, being heated, the given mass expands and cooler, denser air comes in below. The cooler air may feed new O2 to whatever fuel is present to continue the flame. If the fuel is another gas or vaporized liquid mixed in the atmosphere, the flame front moves far faster than expanding hot gases can create a lifting force, and may become an explosion. If the fuel is stationary (wood in a pile) or a gas/liquid feed from a pipe (kitchen gas stove burner), the flame base is stationary but all the involved heated gases rise rapidly ("sucking" in cooler air from the sides or below) till reaching the ceiling, if indoors, or till cooled and finding atmospheric equilibrium outdoors, as in smoke from a campfire or other larger conflagration. In a vacuum, 'things' are different, Sorry, Boyle's law is a description of the relationship between the volume and pressure of a gas in a closed container. It has nothing to do with gas rising or descending. You might be confusing the Ideal Gas Law from thermodynamics or even possibly bouyancy if the container is not a stable size.
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