WATER MOLECULE
The smallest unit of water (chemical symbol H2O); consists of two atoms of Hydrogen (chemical symbol H) and one atom of Oxygen (chemical symbol O). | ||||
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Water (molecule) Definition from Encyclopedia Dictionaries & Glossaries
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Water (molecule)
This article describes water from a scientific and technical perspective. See Water for its importance in sustaining life and humanity, and Water (disambiguation) for other uses.
Water (H2O, HOH) is the most abundant molecule on Earth's surface, composing of about 70% of the Earth's surface as liquid and solid state in addition to being found in the atmosphere as a vapor. It is in dynamic equilibrium between the liquid and vapor states at standard temperature and pressure. At room temperature, it is a nearly colorless, tasteless, and odorless liquid. Many substances dissolve in water and it is commonly referred to as the universal solvent. Because of this, water in nature and in use is rarely clean, and may have some properties different from those in the laboratory. However, there are many compounds that are essentially, if not completely, insoluble in water. Water is the only common, pure substance found naturally in all three states of matter—for other substances, see Chemical properties.
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