At what temperature the density of water is maximum? State its value.

Answer

**Step-by-Step Solution:**

1. **Understanding Density of Water:**
- Density is defined as mass per unit volume. For water, its density changes with temperature.

2. **Identifying the Temperature of Maximum Density:**
- It is known from scientific studies that the density of water increases as the temperature decreases until it reaches a certain point. After that point, as the temperature continues to decrease, the density starts to decrease.

3. **Finding the Specific Temperature:**
- The temperature at which water reaches its maximum density is 4 degrees Celsius. This is a well-established fact in physics and chemistry.

4. **Stating the Value of Maximum Density:**
- At 4 degrees Celsius, the density of water is approximately 1000 kilograms per cubic meter (kg/m³).

5. **Conclusion:**
- Therefore, the temperature at which the density of water is maximum is 4 degrees Celsius, and its value is 1000 kg/m³.

---