The density of water is __________ g/ml?

The density of water at standard temperature and pressure is approximately 1 g/ml. This value is significant in many applications, as it serves as a baseline for comparing the densities of other liquids and solids. The density of 1 g/ml indicates that a milliliter of water weighs one gram, showcasing the unique properties of water that make it essential in various scientific and engineering contexts.

It's also important to understand the implications of the other options. The values of 2, 3, and 4 g/ml suggest densities that are characteristic of much denser substances. For example, substances like mercury have high densities, but they are significantly beyond the standard density of water. Recognizing these differences helps in identifying materials and understanding their behaviors in various applications such as fluid dynamics and thermodynamics.