heat
The cool air will sink and the warm air will rise.
When warm air rises, bubbles of gases dissolved in liquids such as water or soda can also rise to the surface. This is because warm air is less dense than cool air and can carry lighter objects, like bubbles, upwards.
Mostly get hot and rise.
dry air rises up faster because the dry air has less density n therefore it rises up faster than moist air
Hot air balloons are typically powered by propane gas, which is a hydrocarbon made of carbon (C) and hydrogen (H) atoms. As the propane is burned, it releases heat that causes the air inside the balloon to become less dense than the surrounding cooler air, making the balloon rise.
it can rise because of the helium and the gases help make it rise to the sky
Hot air balloons like those from "King Tut Balloons" rise because hot air is lighter than cool air. A burner heats the air inside the balloon, making it less dense than the cooler air outside. This causes the balloon to lift gently into the sky, offering a magical flight over stunning landscapes like Luxor’s temples and pyramids.
Hot air has less mass which make it less dense, thus allowing it to rise over a cold air mass.
yeast
To make a balloon rise in the air, one way is to fill it with a lighter-than-air gas, such as helium or hydrogen. The gas inside the balloon is less dense than the surrounding air, enabling it to float and rise. The amount of gas and the size of the balloon will determine how high it can rise.
because the air becomes less dense and spreads out so becomes hotter and hot air rise so the balloon does.
you add air with rock Air +Rock
There are many chemicals found in a hot air balloon to make it rise. The main elements/chemicals are Helium and Hydrogen.
The 4 lifting mechanisms that make air rise are orographic lifting (when air is forced upward by a mountain or slope), frontal lifting (when warmer, less dense air is forced over cooler, denser air), convergence lifting (when air flows together and is forced to rise) and convectional lifting (when air is heated and rises due to its reduced density).
A balloon needs hot air to make it rise because hot air is less dense than cold air. When the air inside the balloon is heated, it becomes lighter and causes the balloon to lift off the ground and float in the air.
You can add 'air' to make airwave. You can add 'micro' to make microwave.
Simple...hot air rises..