Fill in the blanks:
$(i)$ $A$ bubble in water has .......... free surface.
$(ii)$ $A$ bubble in air has .......... free surface.
$(iii)$ $A$ rain drop has .......... free surface.
$(i)$ $A$ bubble in water has .......... free surface.
$(ii)$ $A$ bubble in air has .......... free surface.
$(iii)$ $A$ rain drop has .......... free surface.
(A) $(i)$ $A$ bubble in water has only one free surface (the inner surface is in contact with air,but the outer surface is in contact with water).
$(ii)$ $A$ bubble in air has two free surfaces (one inner surface and one outer surface,both in contact with air).
$(iii)$ $A$ rain drop has one free surface (the outer surface is in contact with air,while the inner part is liquid).
$(ii)$ $A$ bubble in air has two free surfaces (one inner surface and one outer surface,both in contact with air).
$(iii)$ $A$ rain drop has one free surface (the outer surface is in contact with air,while the inner part is liquid).
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