Question

give reasons for the following
1- sand is solid
2- a gas cylinder cannot be half-filled

Answer 1

1. bcz a particle I.e. grain of sand does not change its volume or Shape.
2. Gas has no fixed Shape and exerts pressure in all directions.
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Answer 2

1.because molecules of sands are closely packed together with a great molecular force of attraction.
2.becase the gas occupies the whole volume of the cylinder.