To convert milliliters to liters, you need to know the conversion factor: 1 liter is equal to 1000 milliliters. Therefore, to find the volume of the sample in liters, you divide the volume in milliliters by 1000.
In this case, the calculation is as follows:
Volume in liters = Volume in milliliters / 1000
Plugging in the values from the question:
Volume in liters = 25 ml / 1000 = 0.025 liters
So, the volume of the sample of water is 0.025 liters.