Which of the following types of water does not contain dissolved gases such as oxygen and carbon dioxide?

Options

A. potable water
B. distilled water
C. saline water
D. soft water

Explanation

To determine which type of water does not contain dissolved gases such as oxygen and carbon dioxide, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Types of Water**: We need to evaluate the four types of water mentioned in the question: portable water, distilled water, saline water, and soft water.

2. **Evaluate Portable Water**:
- Portable water, also known as drinking water, contains H2O, dissolved oxygen (O2), dissolved carbon dioxide (CO2), and various minerals.
- **Conclusion**: Portable water does contain dissolved gases.

3. **Evaluate Distilled Water**:
- Distilled water is produced by boiling water and then condensing the steam back into a liquid. This process removes impurities, including dissolved gases and minerals.
- **Conclusion**: Distilled water does not contain dissolved gases like oxygen or carbon dioxide.

4. **Evaluate Saline Water**:
- Saline water, commonly found in oceans, contains dissolved salts and also has dissolved gases such as oxygen and carbon dioxide, which are essential for marine life.
- **Conclusion**: Saline water does contain dissolved gases.

5. **Evaluate Soft Water**:
- Soft water contains dissolved minerals such as calcium and magnesium salts, and it also has dissolved gases like oxygen and carbon dioxide.
- **Conclusion**: Soft water does contain dissolved gases.

6. **Final Conclusion**:
- Among the options provided, distilled water is the only type that does not contain dissolved gases such as oxygen and carbon dioxide.

### Answer: Distilled Water