As pressure increases, the molecules of a substance come closer resulting in a higher density. ĭensity increases when pressure increases and decreases when pressure decreases. At the sea surface, the density is about 1027 kg/m 3. Seawater has salt and minerals, which make its density higher than normal water. The density of distilled water is the same. At room temperature, water remains in a liquid state. The density of water at 25 degrees Celsius is 997 kg/m 3. At room temperature ( ~ 20 0 C), its value is 998.2 kg/m 3. The density of water is defined similarly to other substances. Density is an intrinsic property of matter having unit kg/m 3 in SI and g/cm 3 in CGS methods. It is given by the number of molecules present in unit volume. Another useful notion is number density, mostly used in the study of gas theory. The density of a substance is defined as the mass present in a unit volume of that substance. Due to this property, the density of ice is less than the density of water at 4 0 C (the maximum density). This behavior is called “density anomaly”. Above 4 0 C, the density of water decreases with increasing temperature. Unlike ordinary liquids, the density of water decreases from 4 0 C to 0 0 C. mass per unit volume of water has some interesting features, different from other liquids. One molecule of water (H 2 O) is composed of two hydrogen atoms and one oxygen atom, bound by two covalent bonds. Water is a tasteless, odorless transparent substance, which can be found in three states: liquid (water), solid (ice), and gaseous (vapor).
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