Why do solids have any number of free surfaces and gases have no free sufaces at all ? Also compare with liquids.

Explanation

### Step-by-Step Solution

1. **Understanding Solids**:
- Solids have a definite shape and volume. This means that they maintain their form and do not change unless a force is applied.
- Solids can have any number of free surfaces. A free surface is an exposed surface of a solid that is not in contact with another solid. For example, a cube has six free surfaces.

2. **Understanding Liquids**:
- Liquids have a definite volume but do not have a definite shape. This means that while the amount of liquid remains constant, it will take the shape of the container it is in.
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