Question

Why do liquids and gases take the shape of their containers while solids do not ?

Answer 1

The molecules in solids are very tightly packed together.
If we take an ice cube, and drop it into a small shot glass, that ice cube is still going to stay in the shape of a cube.

But the molecules of liquids and gases have more energy.
Because they have more energy, they're not as tightly packed together. They have more freedom for movement.
The more energy they have, the more the molecules can move around.
That's why if we take water (a liquid), and we pour it into a shot glass, that water will take on the same shape as that shot glass.

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