The density of pure liquid water is about 1 gram per cubic centimeter (1 g/cm³), which is 1000 kilograms per cubic meter (1000 kg/m³) near 4 °C , where its density is at a maximum.

At typical room temperature (around 20–25 °C), water’s density is slightly lower, about 0.997–0.998 g/cm³ (997–998 kg/m³).

In simple terms:

  • If you have 1 cm³ of water at about 4 °C, it has a mass of roughly 1 g.
  • If you have 1 liter of water (which is 1000 cm³), its mass is about 1 kg under those conditions.

Note: The exact density changes slightly with temperature, pressure, and dissolved substances like salt, but “1 g/cm³” at around 4 °C is the standard reference value taught in science classes.

Information gathered from public forums or data available on the internet and portrayed here.