Why Helium gas is used to fill balloons?

[Arsath]

Hi, I am in need of an answer about why helium gas is preferred to fill balloons than other gas, what is the science behind this. Expecting a valuable answer. Thank you.

[Marketing information removed.]

[AmyCowen]

This is a question you will be able to answer by doing a bit of research either online or at a library. Look up "why helium is used for a balloon," and you will quickly find the reason.

This student project also contains a bit of background information:
https://www.sciencebuddies.org/science- ... background

Amy
Science Buddies