A narrow tube 50 cm length is closed at one end contains air trapped by a certain column of Hg. When the tubes is held horizontally, the air column in if has a length of 10cm. What is the pressure exerted by air when the tube is held vertically with the open end at the bottom and the length of the air column is 15cm? Also find the vertical height of the mercury column inside the tube.

Explanation

To solve the problem step by step, we will use Boyle's Law, which states that the pressure of a gas multiplied by its volume is a constant when the temperature is constant.

### Step 1: Understand the Initial Conditions
- The tube is closed at one end and contains air trapped by a column of mercury (Hg).
- When held horizontally, the length of the air column (L1) is 10 cm.
- The pressure of the air column (P1) when the tube is horizontal is equal to the atmospheric pressure, which is 76 cm of Hg.

### Step 2: Calculate the Pressure When the Tube is Vertical
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