Here's why:
* Water's Density Changes with Temperature: Water's density is highest at 4 degrees Celsius (approximately 1 g/mL). As temperature increases, the density slightly decreases.
* Small Temperature Variation: The difference between 25.1 degrees Celsius and the peak density point is relatively small. Therefore, the density change is minimal.
* Approximation: We use an approximation for the density at 25.1 degrees Celsius because obtaining the precise value would require a more complex calculation.
It's important to note that this is an approximation. More precise values can be found in tables or using online calculators that consider the specific temperature and pressure.