Calculate the energy evolved when 8 droplets of water (surface tension `0.072 Nm^(-1)`) of radius `1.2 mm ` each combine into one.

Explanation

To calculate the energy evolved when 8 droplets of water combine into one, we can follow these steps:

### Step 1: Understand the Problem
We have 8 droplets of water, each with a radius of \( r = 1.2 \, \text{mm} = 1.2 \times 10^{-3} \, \text{m} \) and a surface tension \( \gamma = 0.072 \, \text{N/m} \). We need to find the energy released when these droplets combine into a single droplet.

### Step 2: Calculate the Volume of One Droplet
The volume \( V \) of a single droplet (assuming it's a sphere) is given by the formula:
\[
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