What is the unit of water potential ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Water Potential**: Water potential is defined as the potential of water to do work. It is a measure of the energy status of water in a system and is crucial for understanding water movement in plants.

2. **Symbol for Water Potential**: Water potential is denoted by the Greek letter psi (Ψ).

3. **Components of Water Potential**: Water potential is influenced by two main factors:
- **Osmotic Potential (Ψs)**: This refers to the potential of water to move through a semipermeable membrane due to solute concentration.
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