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Because its density is lower. At constant pressure, a given volume of hot air thus weighs less than the same volume containing colder air. ---------------------------------------- remark: This can be easily seen from the equation for ideal gases p*V = n*R*T, with p: pressure V: volume n: number of particles within the given volume R: ideal gas constant T: Temperature
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Why the fire always goes upward?
Heat always rises. Hot air is lighter than cold air. That's science baby.
What causes hot air balloons to fly?
Usually only balloons that are filled with helium will float. Helium is a gas that is lighter than air, so causes the balloon to fly. Note that if you blow a balloon yourself, it will just float to the ground. There are also hot air balloons in which the air is heated by an on board heater. Hot air, being lighter than cold air, rises and lifts the balloon. When the air cools, unless it is reheated, the balloon descends.
Why does cold air have a higher density than warm air?
Yes, cold air has a higher density than hot air, and that is why hot air balloons rise, it rises above the cold air. hot air is less dense than cold air^
What is the difference between a helium balloon and a hot air balloon?
A helium balloon does not need energy to rise in the air. A hot air balloon needs fuel to rise in air. That is it needs heat energy to rise in air.i love Pizza squares i hope they put helium in then one dayHelium relies on the fact that helium is lighter than air. Hot air balloons rely on the fact that hot air has less volume than cold air and is lighter than the air around it. hot air balloons use hot air to cause the balloon to lift as helium balloons use a special gas to cause lift
Is hot air heavyer than colde air?
Cold air is havier than hot air.
Is hot air liter or heavier than cold air?
Hot air rises, so is lighter than cold air.
When balloons are filled with this they are lighter than air?
Hot air, hydrogen or helium are lighter than cold air.
When balloons are filled with this they are lighter than air.?
Hot air, hydrogen or helium are lighter than cold air.
What is in a hot air balloon to make it fly?
Hot air! Hot air is lighter than cold air.
What keeps hot air balloons aloft?
the hot air inside the balloon is what's keeping the balloon aloft. the explanation is hot gases or air is lighter than cold air so hot air will rise since it is lighter than the cold air.
Why does it have to be hot air and not cold inside the envelope of a hot air balloon?
hot air rises; it is lighter than cool air It does not have to be Hot Air inside the balloon, unless you want that Balloon to rise up.Hot Air is less dense than Cold Air and hence the former is lighter.
Why is warm air lighter than cold air?
Warm air is lighter than cold air because cold air is denser, by dense I mean the particles in cold air are more packed together than it is in warm air. Therefore cold air is heavier which is why warm/hot air always floats above cold air (same thing with hot/warm and cold water). That is why warm/hot air is lighter than cold air.That's the reason why a hot air balloon only goes up when there's something producing hot air (like fire for example), and the only reason it goes back down is if you put out the fire. Remember this only happens because Hot water/air is less dense than cold air which makes it lighter.
How does heat affect flight?
Hot air is lighter than cold air. If you fill a balloon with hot air, the air inside will be lighter than the air outside and therefore the balloon will rise (until the air inside gets cold again).
Is a hot air balloon lighter or heaver then air?
The actual balloon isn't lighter than air, the only reason hot air balloons rise is because they are filled with hot air, which is lighter and less dense than cold air, causing it to rise. :)
How does hot air balloon travel work?
In very simple terms, hot air is lighter than cold air, so it rises.
What makes hot air balloon rise into the air?
What are you, a retard? Even my 5 year old sister knew the answer to this. Hot air is lighter than cold air, thus the balloon with hot air rises higher than the cold air around it.
Why is the top of an oven hotter than the bottom?
Because - hot air is lighter than cold air - and thus it rises.
