Does smoke fall or rise?

Smoke will only rise as long as it is warmer than the surrounding air. At night a pocket of smoke will rise a bit, but as the air around it becomes warmer, it will actually sink back towards the ground and spread out horizontally.

What happens to smoke emitted by a candle?

Smoke is unburned particles of carbon released when the hydrocarbon chain of candle wax breaks down. When the candle is alight, most of the carbon gets burned to carbon dioxide, but some escapes. If you hold a plate above a candle flame, you’ll see the carbon accumulate as a sooty smear.

Why do candle flames rise?

A candle flame keeps pointing up because it heats the surrounding air, creating streaming currents around itself. Warmer air is thinner and lighter than cooler air, since gas molecules spread out when they gain energy. As the heated air near a flame expands, it also rises, since it’s lighter than the air around it.

Does smoke rise or fall indoors?

Tobacco smoke inside a room tends to hang in mid-air rather than disperse. Hot smoke rises, but tobacco smoke cools rapidly, which stops its upward climb. Since the smoke is heavier than the air, the smoke starts to descend.

Why does air rise and fall?

When we heat air, the molecules jiggle and zip around faster, which causes them to spread out. When a mass of air takes up more space, it has a lower density. When you have a lower density fluid immersed in a higher density fluid, the lower density fluid rises and the higher density fluid falls.

Why does a candle light from smoke?

1) When you are burning a candle, you are essentially vaporizing the liquid wax into a gas that is flammable. This vapor can then be used as fuel for the candle flame. 3) Therefore, as you hold a flame close to the smoke it will light the unused wax vapor that is in the smoke.

What kind of changes occur when a candle burns?

Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light.

Why do candles smoke?

Smoke is created when the flame of the candle is unable to properly burn all the fuel (in the form of vaporized wax) efficiently due to a lack of oxygen. The result of this incomplete combustion is sooty carbon, as opposed to typical water and carbon dioxide.

Why does smoke always rise up?

Answer: As we know that smoke is the combination of hot air and hot air becomes light weight with respect to cold air. Thus, it always rises up.

In which direction does the smoke go and why?

Heat travels in air through convection. Smoke goes up in the air because hot air is lighter than cool air.

Why is it incorrect to say heat rises?

Heat does rise. The problem is that sometimes people say this as if the flow of heat is driven by its wanting to rise. It’s not. When we heat air, the molecules jiggle and zip around faster, which causes them to spread out.

Why does heat rise up?

Answer 1: Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.