If 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms? (Relative density of mercury = 13.6).

Explanation

To solve the problem of finding the difference in the levels of mercury in the two arms of the tube after pouring 15 cm of water and spirit into their respective arms, we will follow these steps:

### Step 1: Identify the heights of the liquids
We start with the initial heights of the liquids in each arm of the tube:
- The height of water in one arm (h1) is initially 10 cm, and we add 15 cm of water, making it:
\[ h_1 = 10 \, \text{cm} + 15 \, \text{cm} = 25 \, \text{cm} \]
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