In the table, the density of water is 1000 kg/mÂ³ at 4â„ƒ and as the temperature falls below freezing point (0â„ƒ), the density decreases. As water is heated, the kinetic energy increases which results in greater vibration of molecules. The molecules expand and take up more volume which decreases the density. Water at 0â„ƒ is a strong open lattice made up of hydrogen molecules. This structure makes the ice denser than normal water, which is why ice is less dense than water and it floats on water.
The density of water also changes with substances like gases, minerals, bacteria, salts, and more dissolved in it. Salinity of water also changes the density of water. Seawater is denser than pure water. Also, in the case of heavy water ice (Dâ‚‚O), it sinks in pure water as it is denser than pure water.
Density of water as a standard measure
The density of water is used as a standard measure by which the density of other liquids is measured. A hydrometer is used to measure the density of a liquid. It consists of a stem and a bulb, which makes it float. The hydrometer is dipped into the liquid until it floats freely and markings indicate the density.
As pure water is the standard for other liquids, the mark for pure water at 4â„ƒ is recorded as 1000 kg/mÂ³. Based on the standard marking of pure water, the density of the other liquids is measured. A hydrometer will float lower in the liquids with lower density and higher in the liquid with higher density. A hydrometer is used in various laboratories and industries to measure the density of various liquids. Apart from pure water, pure ethanol is used as a pure liquid as a standard for measuring density. Like pure water, ethanol doesnâ€™t have a maximum density point at 4â„ƒ.
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