What is the effect of pressure on water potential? Pressure potential is positive or negative?

Explanation

### Step-by-Step Solution:

1. **Understanding Water Potential**: Water potential is a measure of the potential energy in water, influencing the movement of water within plants. It is determined by two main components: solute potential and pressure potential.

**Hint**: Remember that water potential is crucial for understanding how water moves in plants.

2. **Components of Water Potential**: Water potential (Ψ) can be expressed as:
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