W

Water

IUPAC: oxidane

H2O Inorganic Compounds CAS 7732-18-5
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Quick Reference
Formula / NotationH2O
CAS Number7732-18-5
Molecular Weight18.015
Melting Point32 °F
Boiling Point212 °F at 760 mmHg
Density1
SolubilityCompletely miscible
AppearanceWater appears as a clear, nontoxic liquid composed of hydrogen and oxygen, essential for life and the most widely used solvent. Include water in a mixture to learn how it could react with other che...
Also Known Asoxidane; 7732-18-5; Distilled water; Dihydrogen oxide; Purified water; Sterile water; Water vapor; Water, deionized; aqua; Water, purified
CategoryInorganic Compounds

What is Water?

Water is an oxygen hydride consisting of an oxygen atom that is covalently bonded to two hydrogen atoms. It has a role as an amphiprotic solvent, a mouse metabolite, a Saccharomyces cerevisiae metabolite, a member of greenhouse gas, an Escherichia coli metabolite and a human metabolite. It is an oxygen hydride, a mononuclear parent hydride and an inorganic hydroxy compound. It is a conjugate base of an oxonium. It is a conjugate acid of a hydroxide.

Formula & Notation

H2O

IUPAC Name: oxidane

Other Names / Synonyms: oxidane; 7732-18-5; Distilled water; Dihydrogen oxide; Purified water; Sterile water; Water vapor; Water, deionized; aqua; Water, purified

Properties & Characteristics

Appearance: Water appears as a clear, nontoxic liquid composed of hydrogen and oxygen, essential for life and the most widely used solvent. Include water in a mixture to learn how it could react with other che.... Molecular formula: H2O. Molecular weight: 18.015 g/mol. Boiling point: 212 °F at 760 mmHg. Melting point: 32 °F. Density: 1. Solubility: Completely miscible. Vapor pressure: 23.75 [mmHg]. LogP: -0.5.

Physical Data

PropertyValue
Melting Point32 °F
Boiling Point212 °F at 760 mmHg
Density1
Molecular Weight18.015
SolubilityCompletely miscible
AppearanceWater appears as a clear, nontoxic liquid composed of hydrogen and oxygen, essential for life and the most widely used solvent. Include water in a mixture to learn how it could react with other che...

Uses & Applications

Used in industrial processes, materials science, semiconductor manufacture, ceramics, or as a catalyst.

Safety Information

May be corrosive, toxic, or an oxidising agent. Handle in well-ventilated area. Consult SDS before use.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Water
Formula H2O
CAS Number 7732-18-5
Molecular Weight 18.015
Synonyms oxidane; 7732-18-5; Distilled water; Dihydrogen oxide; Purified water; Sterile water; Water vapor; Water, deionized; aqua; Water, purified

Frequently Asked Questions

Water is an oxygen hydride consisting of an oxygen atom that is covalently bonded to two hydrogen atoms. It has a role as an amphiprotic solvent, a mouse metabolite, a Saccharomyces cerevisiae metabolite, a member of greenhouse gas, an Escherichia coli metabolite and a human metabolite. It is an oxygen hydride, a mononuclear parent hydride and an inorganic hydroxy compound. It is a conjugate base of an oxonium. It is a conjugate acid of a hydroxide.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.