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2006-09-11 16:26:56 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
I'm not sure what detail you want the answers to be but....
It rises very gently, almost imperceptibly. It is so gentle, if you aren't looking outside, you wouldn't know you have left the ground.
And as to why it rises....
Air balloon traps hot air inside the balloon (called envelope) and keep heating it with a large propane burner. When the air is heated, it expands because molecules starts to move about in rapid fashion and the distance between molecules enlarge. That causes the density of the air to reduce.
When the density of the air becomes less, it weights less relative to rest of the air outside the balloon. Because it weights less, it rises.
The air inside must be heated continuously to compensate for cooling. When the burner is turned off, the hot air balloon will actually decent quite rapidly. The pilot controls the height by switching on and off the burner.
2006-09-11 16:38:16 · answer #1 · answered by tkquestion 7 · 1⤊ 0⤋
Hot air rises because WELL...
The pressure in the atmosphere falls as you go upwards, because there is less air above you pushing down. This is why air pressure is lower up a mountain.
Consider a metre cube of air. The pressure at the bottom of the cube is higher than that at the top of it, by ro.g.h where ro is the density of air (about 1 kg per cubic metre), g is the acceleration of gravity (10 m/s/s) and h is our 1 metre cube side. This means there is a force pushing the cube of air upwards of ro.g.h times the area of the cube - ie 1m x 1m. This makes 10 Newtons pushing up. But our cubic metre of air (1 kg mass) weighs 10 Newtons, so it goes nowhere.
Now consider a cubic meter of warm air at the same point. If its density (because its warm) is say 10% lower than the surrounding air, then the force up will still be 10 Newtons, but its weight down will only be 9 Newtons - so up it goes.
Exactly the same applies in water. So stones sink because the pressure difference created as above is much lower than the weight down.
2006-09-11 16:33:42 · answer #2 · answered by SirHyde 3 · 0⤊ 0⤋
Hot air is less dense than cold air -- it weighs less. So the balloon is displaced upward by the heavier surrounding air.
2006-09-11 16:33:28 · answer #3 · answered by Anonymous · 0⤊ 0⤋
quite speaking, i'm not as affected person as you, to look at those form of issues... I merely can tell the respond. My answer is for particular. Its an inclination of a warm air to upward push.. this does not recommend that it will not upward push if the encompassing air is of the comparable temperature. while its surrounding temperature is of the comparable temperature, there may be no circulate of warmth, subsequently the temperature will proceed to be consistent. this might save the nice and comfortable air arised. If the temperature around it cools down, there may be a circulate of warmth, which will quiet down the air, subsequently sinking it.
2016-10-14 22:00:15 · answer #4 · answered by shade 4 · 0⤊ 0⤋
hot air lighter than cold air so when it is filled in the baloon the baloon rises
2006-09-11 16:34:21 · answer #5 · answered by sam 1 · 0⤊ 0⤋
Magic.
2006-09-11 16:35:54 · answer #6 · answered by xeuvisoft 3 · 0⤊ 0⤋
Heat.
2006-09-11 16:33:26 · answer #7 · answered by mphsgurl79 3 · 0⤊ 0⤋
very slowly.....
actually heat rises, when trapped in the balloon...it rises.....
2006-09-11 16:32:53 · answer #8 · answered by Anonymous · 0⤊ 0⤋
helium
2006-09-11 16:29:32 · answer #9 · answered by linda l 2 · 0⤊ 0⤋
duh do you think that it could beeeeeeeeeeeee from the hot air??????????????????????
2006-09-11 16:33:02 · answer #10 · answered by mysticideas 6 · 0⤊ 0⤋