Question

what property of the fas helium makes it useful in balloons?
plz answer its urgent​

Answer 1

helium is lighter then the gases in air hence it makes balloons float above in sky

Answer 2

Answer:

Helium has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can explioit these properties. Helium was the first gas used for filling balloons and dirigibles.