The water potential of pure water is:

Options

A. Zero
B. Less than zero
C. More than zero but less than one
D. More than one

Answer

To determine the water potential of pure water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Potential**: Water potential (Ψw) is a measure of the potential energy of water in a system and is influenced by solute concentration and pressure. It is expressed in units of pressure (usually in bars or megapascals).

2. **Pure Water Characteristics**: Pure water is defined as water that contains no solutes. This means that the solute potential (Ψs) of pure water is zero because there are no solutes present to contribute to the water potential.

3. **Standard Conditions**: Water potential is typically measured at standard temperature and pressure (STP). Under these conditions, the water potential of pure water is defined to be zero.

4. **Conclusion**: Since pure water has no solutes, its water potential is 0. Therefore, the answer to the question is that the water potential of pure water is 0.

### Final Answer:
The water potential of pure water is **0**.

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