what is lighter a balloon filled with helium or air?

Question

it is for a science projsrct i am doing

Answer 1

helium is much lighter than regular air, (which is mostly composed of nitrogen and oxygen, and a few other things).

Answer 2

On a scale on which the lightest gas known, hydrogen, is 2, helium is 4 and air is a bit over 28 in mass. So you can see that helium is a lot less dense than air.

Answer 3

Helium has a lesser density than air. This is the same as saying that air has a greater density than helium.

Answer 4

Ok, helium is lighter than air, but not only because it's atomic mass is small, and definitely not because it's just one element and air is a mixture.

Radon, atomic mass ~222, has a density 0.00973 g/cm3, while litium, atomic mass ~7, is 0.535 g/cm3 at standard temperature...

Also, osmium is just one element, and with a density of more than 22 g/cm3 is definitely heavier than most commonly used alloys, which are MIXTURES of different metallic elements...

Helium is lighter than air because it has a low atomic mass AND the stuff we are talking about are all gases. In gasous substances, atomic mass and density are closely related, since one mole of any gas occupies the same volume at a given temperature and pressure - and having the same number of heavier particles (in the case of air, mostly MOLECULES, eg N2, molecular mass ~28, O2, molecular mass ~32, H2O, molecular mass ~18, but also atoms of argon and other noble gases) in the same volume means a greater density.

Answer 5

The atomic mass of helium is lighter and less dence then air allowing it to float.

Answer 6

a ballon with helium because helium is jsut one element and air has more elements than helium so that is why helium is lighter:-)

Answer 7

helium

Answer 8

helium

Answer 9

helium, that's why it floats in air.

Answer 10

helium, thats why they float, but when you blow into a ballon it doesn't. they teach science in kindergarten now?