Will a hot air balloon still rise if the surrounding air is the same temperature?
412631
A balloon filled with hot air rises because of the force of buoyancy. That means the density of air inside is lesser than the surrounding air (because hot air expands thus density decreases) and thus there is an upthrust acting on the balloon. Now, if the surrounding air is at the same temperature then its density is same as that inside the balloon and so the balloon will not rise. But the balloon will not not remain at the same point. it will fall because of the weight of the rubber in it.\n    In case of exploration on other planets, firstly other planets have very low density of air in the atmosphere (most of them do not have any air) and secondly even then is one wants to use this one has to heat up the balloon to a temperature for which the density decreass lower than the surrounding. Hope this answers your question.
439062
Think of a helium balloon.
282829
This is similar to asking why gravity doesn't affect boats. It does, but buoyancy keeps them above water. Similarly, if you push a hollow rubber ball down to the bottom of a pail of water and simply release it, it will pop back up to the surface.\nThe helium balloon is just being pushed up by the relatively higher air pressure under it. See the sources for a detailed calculation and a diagram of the pressure situation.
160259
if it is an ideal gas is definitely will\npV =nRT\np increase then T increase if V is stationary
331738
A full baloon will weigh more if you are filling it with room air.  The air under pressure will mean there are more molecules in the balloon.  More molecules of 'x' weigh more than fewer molecules of 'x'.
795941
There is a little trick to this question, Alyssia. \nWe can try to use the ideal gas law to calculate the change in volume.\n P1V1 / T1 = P2V2 / T2  \n\nKeep in mind that temperature is absolute, not celsius, so T1 is 273.15 + 20 = 293.15 and T2 is 273.15 - 196 = 77.15\n\nSolving for the second volume, we get the equation V2 = V1 * P1/P2 * T2/T1.  \nSubstituting the given values we have V2 = 2.91 * 1/5.2 *  77.15/293.15\nTherefor the new volume might be .147 L.\n\nHowever, the balloon will loose all elasticity before reaching that temperature.  Therefor the actual starting and ending pressures of the gas INSIDE the ballon cannot truely have the same ratio as the starting and ending pressures outside the ballon.  For a real balloon, the answer is too difficult for me to calculate.  \n\nFor a theoretical balloon that keeps a constant elasticity, the answer is .147 L.
1136431
Should be simple.  Warm air rises because it is less dense than cool air.  Cool air rushes in to replace the rising warm air.\n\nPlug this simple formula into the complex real world of spinning globe, equitorial heat and polar regions & you get weather.
701523
Good ? fernando,\n\nI thought about this problem and remembered blowing up balloons long, long ago in my childhood.  (It actually is easier to blow when the balloon gets larger).  \n\nReason: the material stretches in the larger balloon and becomes thinner, so the elastic modulus is inversely proportional to size.  Ergo, when the 2 are connected, air will flow from the smaller to the larger, since the smaller one has more pressure.\n\nI realize this is not a formal proof, but it will have to do for now!
479309
Yes, but only on a plane, glider, helicopter, hot air balloon or a rocket......
372306
Depends on how much helium you put into it, and how big your baloon is, and how and where you release it, and... it may well heep going up and up and up to the top of our atmosphere if you put enough in.
1152217
Yes since it would reach it's terminal velocity after a few feet. &  DUE TO THE DRAG IT WOULD NOT ACHIEVE THE SPEED OTHERS are THINKING IT  would ACHIEVE.Given that air is present .
971232
yes,put some sellotape on the balloon first.
1052
The hot air weighs less then unheated air. The Air molecules move around faster. With the lighter air, the lanterns float up.. Causeing the garbage to float into someone elses yard
1127230
No, it's a nice idea though. As the balloon rises the pressure outside it will drop causing the gas inside the balloon to expand until eventually the balloon will pop. Sorry to burst your bubble as it where; I love the idea of space being filled with these multi coloured balloons though :))
469382
depends on the time of day. During a hot day the air balloon would pop first because air heats up juch faster than water. at night the air balloon would actually shrink because the air in the balloon would contract because of the cold air.
53886
Since the air inside the balloon is heated, the molucules are more active and therefore spread out. The weight of the air inside the ballon is less than the weight of the air that the ballon displaces.
10432
The balloon is filled with hot air by the burner.  The hot air inside the balloon rises because it is lighter than cold (or cooler air).  assuming you mean't a hot air balloon.\n\nNobody is sure about helium ballons because we always suck the helium out so we can talk weird.