silence
Hot air, hydrogen or helium are lighter than cold air.
Holes.
The answer is a balloon. Balloons are lighter than air due to the helium or hydrogen gas they are filled with, but even with a hundred people, they cannot be lifted due to their buoyancy and the mass of air displaced by the balloon.
No. Helium is lighter than air
Balloons filled with it float in air
Helium is lighter than air.
Because helium is lighter than air.
Holes.
Hot air, hydrogen or helium are lighter than cold air.
bcoz helium is lighter than air
yes, anything with a lower atomic number would be lighter, for example, helium is lighter than air, which is why balloons float when filled with helium... the lighter substance rises above the heavier....
A Helium filled baloon floats in air because Helium is lighter than air. Making it rise to the top of it.