Hot gases have less density than cooler gasses and so they "float" (move upwards). What you see of fire are hot gases that are oxidizing and giving off light.
Experiment:An interesting experiment is to put a short candle in a jar with a tight lid. Light the candle and put on the lid, measure the time it takes for the candle to "suffocate".
DON'T burn your fingers now!
Repeat the experiment but this time as soon as the lid is on tight drop the jar (preferably from over two meters) and see if the flame does not go out much quicker because the hot gasses will not "float" up in the accelerating frame of reference that is the inside of the jar.
Make sure the jar does not break by having something soft (a pillow or jumble of rags in a basket) where the jar lands.
== Flames generally "go up" because the hot gas produced due to combustion, being much hotter and lighter than the surrounding air, have a lower density and hence rise against the downward pull of gravity. == Fire burns upwards because as the heat grows then there is less oxygen in the air and as a result then the fire has to find more oxygen so that it can continue to burn
Fire moves upward due to the natural convection process. As the fire heats the surrounding air, it becomes less dense and rises, creating a flow of air upwards. This convection current carries the flames and heat upwards, which is why fire tends to move in an upward direction.
Fog typically forms near the ground and rises upwards in the atmosphere.
The smoke from an active fire rises in the surrounding air because it is less dense than the cooler surrounding air. It doesn't know anything about the idea of convection, and it doesn't need to, in order to behave appropriately.
water cannot travel upwards, because 1) gravity 2) there is a property of water that does not allow it to flow upwards Water can move upwards by capillary action, forced upwards by a pump or natural geyser, it can be carried upwards and can rise in the form of steam or vapour.
When tissue paper is lit on fire, the heat causes the air inside the paper to expand, creating a force that pushes the paper upwards. This rising effect is due to the rapid combustion of the tissue paper, which releases energy and gases that propel the paper upwards.
it decreases
Yes. Fire goes upward precisely because Earth's gravity pulls things downward. The fire is lighter (less dense) than the air that replaces it, so the air pushes the hot air from the fire upwards.
The hot air is less dense so cold air rushes in to shove it upwards like a cork on water.
It will expand. It would rise upwards even if it weren't brought into a warm room. As the temperature increases, the volume will also increase in order to maintain the pressure.
Not an English word, if you mean "raises" to make something rise (go upwards).
== Flames generally "go up" because the hot gas produced due to combustion, being much hotter and lighter than the surrounding air, have a lower density and hence rise against the downward pull of gravity. == Fire burns upwards because as the heat grows then there is less oxygen in the air and as a result then the fire has to find more oxygen so that it can continue to burn
Fire burns upwards due to the process of convection. As the air around the fire heats up, it becomes less dense and rises. This creates a flow of air that draws more oxygen into the fire, allowing it to burn more vigorously and continue to rise.
Fire moves upward due to the natural convection process. As the fire heats the surrounding air, it becomes less dense and rises, creating a flow of air upwards. This convection current carries the flames and heat upwards, which is why fire tends to move in an upward direction.
Fog typically forms near the ground and rises upwards in the atmosphere.
The smoke from an active fire rises in the surrounding air because it is less dense than the cooler surrounding air. It doesn't know anything about the idea of convection, and it doesn't need to, in order to behave appropriately.
Mercury is more dense than water.