The density of liquid water at 25 degrees Celsius is approximately 0.997 g/ml. This value indicates that one milliliter of water has a mass of about 0.997 grams at this temperature.
Density is defined as mass per unit volume and can vary with temperature and pressure. For water, its maximum density occurs at around 4 degrees Celsius. As water is heated or cooled away from this temperature, its density decreases slightly. At 25 degrees Celsius, the density is very close to 1 g/ml, which is a convenient reference point for many scientific calculations.
This slight variation in density is important in various natural and scientific processes, including buoyancy, the behavior of aquatic life, and the characteristics of fluids as they are heated or cooled.