Question

Weather balloons sometimes filled with helium rather than hydrogen. Why?​

Answer 1

Answer:

If you buy a balloon from a vendor, it's probably filled with helium. ... This is because helium is less dense. Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium.

Answer 2

Answer:

Helium is lighter than air. If you take the same volume of air and helium and weight them on a scale, the helium will weight less. This is because helium is less dense. Because helium is lighter than air, a helium balloon rises.Hydrogen is another gas lighter than air; it is even lighter than helium. Hydrogen is not used in balloons because it is highly inflammable. So helium is used.

                               

                          Hope it helps you^_^