The density of water is 1 g cm-3
How is density measured?
We define density (ρ) as the ratio of an object’s mass to the volume it occupies. The equation is given by
ρ = m/v
However, water’s exact density depends on both the air pressure and the temperature of the area. Once you get below water’s freezing point (32°F/0°C), the water density decreases because ice is less dense than water. This is why ice floats on top of water and, when you put ice cubes in a glass of water