Question

When a number of droplets coalesce to form a single drop, the total surface area of the drop ______.

Options

• decreases

• becomes zero

• remains same

• increases

Answer 1

When a number of droplets coalesce to form a single drop, the total surface area of the drop decreases.

Explanation:

When many small droplets combine to form one large drop, the volume remains the same, but the radius increases. Since surface area depends on r², the total surface area decreases. This happens because the system tends to minimize surface energy due to surface tension