A solid weighs 120 gf in air and 105 gf when it is completely immersed in water. Calculate the relative density of solid.

Explanation

To solve the problem of calculating the relative density of the solid, we can follow these steps:

### Step 1: Understand the Weights
- The weight of the solid in air is given as 120 gf (gram-force).
- The weight of the solid when immersed in water is given as 105 gf.

### Step 2: Calculate the Loss of Weight in Water
- The loss of weight when the solid is immersed in water can be calculated as:
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