why do fire burn uppward against gravity?

Question

more about fire's nature

Answer 1

simple, heat rises

Answer 2

When something burns, the chemical reactions that are occurring release heat. The heat warms the air in and around the fire. Warm air rises. That is why it is sometimes hotter up near the ceiling than down by the floor. When the warmed air in and around the fire rises upward, more air flows toward the fire to replace the part that went up. The inflowing air comes from all directions --from around the sides and from under the burning material. This airflow tends to confine the flames. As a result, the flames have nowhere to go but up.

Answer 3

OK. Fire and gravity.

Heated gasses are lighter than colder gasses. This makes them rise. Flames are nothing else than gasses that have a reaction with oxygen. This effect gets a circulation going drawing fresh air (oxygen) to the reaction.

In a gravity free environment it is very hard to get a fire going. The flames are very erratic because the oxygen has no continual flow to the source. Maybe there is some footage of this on the net. It looks pretty impressive.

Answer 4

in my opinion,it has something to do with the air.since fire makes the air heated and this makes the air more drier,because the drier air is lighter than the moisty air,so the drier air will move up which makes fire buring upward.
another reason is related with oxygen.Since burning is depending on the amount of oxygen,when the fire is burning,
the oxygen in surrounding area will be short of oxygen ,then,oxygen from other areas will be pulled into the burning center ,which will produce some airstream movement.
This movement will drive the NO2 out and attract more oxygen ,also,under the same circumstance,the weight of oxygen is less than that of NO2.
This explanation is just from my memory.If you want an exact answer,you should ask your teachers who teach physics.
Best wishes!good luck! that is a good question.well-done.

Answer 5

In a vacuum it won't be able to burn (no oxygen to assist combustiuon). yet in 0-g a hearth has no 'convection' to hold combustion with the help of-products and introduce sparkling oxygen. i've got viewed video clips of a hearth intentionally started interior the return and forth and this is only a small sphere of flame that lasts a pair of seconds and is going out. The physics all makes appropriate experience, even regardless of the undeniable fact that this is nonetheless kinda weird and wonderful to particularly watch it ensue ? Doug

Answer 6

Heat rises. It carries with it the burning gasses from the material being consumed - These are the flames. The gasses are rising due to a force(heat) that is locally stronger than the gravity required to prevent them from rising. As the gasses themselves are consumed they , along with particulate matter (ash and smoke) rise until they cool enough to begin dissipating. The particulate matter then becomes subject to gravity and settles.

Answer 7

Quite simply because when something burns we say for example, " The house went up in flames." So up the flames go. Seriously the flames consume oxygen and creates a vacuum, so the flames are sucked upwards.

Answer 8

Fire produce Heat and hot air which goes away from land as such it happens.

Answer 9

Cause fire is air in combustion, and air doesnt care about gravity.

Answer 10

Because fire is a type of air.