What is capillarity? Derive an expression for the height to which the liquid rise in capillary tube of `r` with angle of contact ` theta`. Give two examples of capillarity from daily life.

Explanation

### Step-by-Step Solution

**Step 1: Definition of Capillarity**
Capillarity, also known as capillary action, is the ability of a liquid to flow in narrow spaces without the assistance of external forces. This phenomenon occurs when a liquid rises or falls in a capillary tube due to the combination of cohesive and adhesive forces.

**Step 2: Understanding the Forces Involved**
When a capillary tube is placed vertically in a liquid, two main forces act on the liquid:
- **Cohesive Forces**: These are the intermolecular forces between the liquid molecules that cause them to stick together.
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