What is the density of water at standard conditions?

The density of water at standard conditions, which are typically considered to be at 4 degrees Celsius and 1 atmosphere of pressure, is 1 gram per milliliter (g/mL). This value is a reference point for many other substances as it is often used in calculations and comparisons involving density.

The reason why this density is significant lies in the unique properties of water, such as its role in supporting life and its behavior in different states. The density of 1 g/mL indicates that a milliliter of water weighs one gram, which is a ratio that is easy to use in various scientific calculations. It's also important to note that the density of substances can vary significantly, which is why options suggesting densities of 0.5 g/mL, 1.5 g/mL, and 2 g/mL are not accurate for water at standard conditions. These values would correspond to either much less dense or much denser substances than water.