Will a hot air balloon still rise if the surrounding air is the same temperature?

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.

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.

Inside Hot Air Balloon

Honestly speaking, i'm not as patient as you, to look at all these things... I just can tell the answer. My answer is yes. Its a tendency of a hot air to rise.. this does not mean that it will not rise if the surrounding air is of the same temperature. When its surrounding temperature is of the same temperature, there would be no transfer of heat, hence the temperature will remain constant. This will keep the hot air arised. If the temperature around it cools down, there would be a transfer of heat, which will cool down the air, hence sinking it.

no the balloon will not rise actually hot air is filed in balloon because as air is heated it becomes less denser and so the balloon rises but when both outside& inside temps of balloon are same either cold or hot how can it rise.you can perform an experiment

1.take an empty glass bottle and keep it in a vessel of water.

2.now fix a balloon 2 its mouth,

3.start boiling the water in vessel as water heats the air inthe bottle gets heated and the baloon rises

4.see this happens only because the inner temp is greater than outer

MY CONLUSION IS FOR BALLOON TO RISE IT SHOULD B AT IGH TEMP THAN SURROUNDING

When the temperatures of both inside and outside are same, then we cannot say that the air inside the balloon is hot.

The hot air balloon works because of the temperature difference.

You have to think of other ways only.

The helium balloon goes up, even though, the temperature inside and out side is same.

In hot air balloon air is made to have less density by heating.

In helium balloon helium by its very nature is less dense than air.

If the surrounding air has the same temperature with the air inside of the hot air balloon, then the hot air balloon can no longer be named a hot air balloon, therefore we really don't have a question...

No it would not rise, if the outside temp and the inside temp were the same. If the air outside the balloon on some planet were hot, we could probably just suck that in and supply a heat source, heat it more, but that's a guess. And no I don't believe you can control this, your talking about controlling the temp outside, with no container, we could not heat the planet air temp, again a guess. At least as of yet we couldn't control this.

hot air is lighter than surrounding air because its density is reduced by heat (and therefore pressure is increased). it depends on pressure and density as well as temperature, so u have to specify more

The formula is PV=nRT

the baloon may rise or not based on other criteria, not just temperature :)

no, the resons regarding the pressure given earlier is correct

The hot air outside the balloon would also be rising, carrying the (relatively) stationary balloon with it!