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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 with a hint of
blue, 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 pure, 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 substance found naturally in all three common states of
matter?for other substances, see Chemical proper
