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Since hotter air is less dense than colder air, it becomes lighter than the surrounding air. Cold air filling a certain space has a certain mass. Since warmer air takes up more space, it takes less warm air to fill the same space, giving it less mass. There is less air there, so it has less of a mass, allowing it to float on top of the other air.

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Q: Why does a change in the density of the air make the hot air balloon ascend?
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Why does a change in density of the air make the balloon ascend?

A gas of low density has the tendence to ascend.


When is the density of a hot air balloon the greatest?

enough to make me hard


How would you make a balloon get the maximum elevation it can get?

Make the balloon capable of further expansion. That way as the balloon rises and the barometric pressure falls the balloon can expand and allow its internal gases to achieve a constantly decreasing density.


When you put a balloon in a cold room then in a worm room does its density change?

No. The volume of the helium will change as it expands the balloon due to the increase in temperature. The density of an element never changes. The reason for that is because density is just a fancy way of saying 'The atoms are this far apart' in the equation mass/volume = density.


How does adding salt to water make an egg float?

because salt increases the density of water so, egg ascend to top


How do particles make a hot air balloon work?

The hot air has a density under the density of cold air. And so up in the atmosphere.


What gas put in a balloon would make it fall?

Any gas that is more dense than air.Answer:It is a bit more complex than that - an air filled balloon would still fall because air has the density of air. In a normal inflated balloon the air in the balloon is compressed and has a density more than uncompressed air. If the "balloon" were a plastic bag wiith no air pressure above the pressure of the surrounding air, the balloon would still fall as the combined (average) density of the balloon/bag system is greater than the surrounding air. Even if the balloon were filled with a gas with a lower specific gravity than air the balloon wll fall if the compressed gas density excedes that of the surrounding air or if the combined (average) density of the balloon/bag or balloon system is greater than the surrounding air.


Why would heating the gas in air balloon make the balloon rise?

Heated gas has a lower density than environmental air.


Which of the folowing is a chemical change A. you melt butter B.you make cookies C.you make a pitcher of orange juice from concentrate D.you blow up a balloon?

Making cookies would constitute a chemical change.


How is the average density of a heluim balloon be changed to make it rise float at a constant level and sink?

you would have to deacrease the density. By doing so, you can float. I don't know bout constant level, but because the air in the balloon is more dense than outside air, the balloon will sink in air. p.s. i know you s.j.v students are probably reading this :)


Does cake change density when it bakes?

The density will make the difference between a fluffy cake and a hard cake.


Why would heating the gas inan air balloon make the balloon rise?

because as you heat the gas, you cause the gas to expand on the container (whish is a balloon), this lowers the density, and a less dense fluid submersed in a denser fluid will rise, like an air bubble rises from underwater