Why a flame always points upwards?

Answer 1

The combustion reaction heats the air, causing the air molecules to vibrate faster and move further apart. This means that the gas in the flame expands and becomes less dense than the air around it, causing it to rise.

Answer 2

Flames point upwards due to the effects of convection. Hot air rises, causing cooler air to be drawn in beneath the flame. This constant movement of air creates a vortex that propels the flame upwards.

Answer 3

Because heat rises. Whether its a flame on a candle or a fireplace, the heat makes the flame rise up.
The base of a flame is where oxidation of the wax occurs which is an exothermic reaction, this means potential energy is lost from the wax as heat.

The heat released is most concentrated at the base which causes vaporisation of the wax to occur and oxidation occuring in the vaporised wax which is a form of positive feedback (the more vaporisation, the more vaporisation that can occur)

As the gaseous wax is hotter than the surrounding than the surrounding air it means that it rises since as upthrust is produced, this is why the flame rises upwards rather than any other direction.

The flame is the excitation of electrons due to the high temperatures, and when the nearby gases cool the temperature decreases so the electrons return to their ground state and release energy in the form of photons (light).

Answer 4

The combustion reaction heats the air, causing the air molecules to vibrate faster and move further apart. This means that the gas in the flame expands and becomes less dense than the air around it, causing it to rise.

Answer 5

Put simply, heat rises. The combustion reaction of the fire heats the surrounding air causing those air molecules to move faster with a lower pressure and lower density. Just as air bubbles rise in water, these heated "bubbles" rise through the cooler air.

Answer 6

Fire or flames are the results of combustion and generates heat, the air and the flame are hot from this combustion, in an atmosphere hot gases are lighter then cold gases, The hot air is lighter than the colder air and raises to a greater height then the colder air, The results is that the flame appears to be pointing upwards when in fact its the hot gases raising upward as they are lighter.

The exception to this is like a gas welding torch which the pressure of the release gas pushes the flame in the direction of the torch head due to the pressure behind it.

Answer 7

Yes, because the hot air in the flame rises because it is lighter than the cold air above. The wax particles of the smoke may be denser than air but they get carried up in the hot air of the flame.In zero gravity, there is no rise of hot air so in this case like on the space station the flame would be round in shape, like a spherical dome.

Answer 8

cause if burns the other water it will go out

Answer 9

That's because of gravity. The gravity pulls the heavier air down, so the lighter (hotter) air is pushed up.

Answer 10

That is because gravity pulls downwards. The hot gas in the flame is lighter than the surrounding air, so the air pushes it up.