Definition - What does Water Density mean?
Water Density is the ratio of mass per unit volume of water. The density of water is affected by the temperature and salinity of the water. It is nearly about one gram per cubic centimeter. Water is unimodal in nature thus it becomes highly dense when cooled at room temperature. Water Density plays a vital role in circulating heat and causing ocean currents. A hydrometer is the best instrument to measure Water Density. It looks exactly like a thermometer and consists of cylindrical stem and a weighted bulb thus makes it float upright.
Petropedia explains Water Density
The density of water can be stated as the measure of volume and mass of the water. Water Density is never absolute as it depends upon two factors- temperature and salinity. Generally, the density of pure liquid water is 1. It implies that density which is less than 1 will float over the surface whereas density which is more than 1 will sink to the bottom. For example an object with a density of 5 will sink in water whereas ice, which has a density of 0.92 floats on water. However, density does not depend on the shape and size of the matter.