science
Grade-2
Easy

Question

Which one of the following is an example of gas?

hintHint:

A balloon is filled with a gas called helium.

The correct answer is:


    • The actual balloon is solid and the air inside is a gas. 
    • Helium is a gas that is filled in some ballons that fly higher than normal ballons.
    • Helium balloons are of high commercial importance.