Which SI units would you use for the following measurements?
the mass of the water in the pool

Answer

To determine the appropriate SI unit for measuring the mass of the water in a pool, follow these steps:

### Step-by-Step Solution:

1. **Identify the Measurement**: We need to measure the mass of the water in the pool.

2. **Understand the SI Units**: The International System of Units (SI) has specific units for different types of measurements. For mass, the SI unit is defined.

3. **Determine the SI Unit for Mass**: The SI unit for mass is the kilogram (kg).

4. **Apply the SI Unit to the Context**: Since we are measuring the mass of a large quantity of water (like that in a pool), we will use kilograms as the appropriate unit.

5. **Conclusion**: Therefore, the SI unit you would use for measuring the mass of the water in the pool is kilograms (kg).

### Final Answer:
The SI unit for the mass of the water in the pool is **kilogram (kg)**.

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