High Quality Content by WIKIPEDIA articles! Hydrogen fluoride is a chemical compound with the formula HF. It is the principal industrial source of fluorine, often in the aqueous form as hydrofluoric acid, and thus is the precursor to many important compounds including pharmaceuticals and polymers (e.g. Teflon). HF is widely used in the petrochemical industry and a component of many superacids. HF boils just below room temperature whereas the other hydrogen halides condense at much lower temperatures. Unlike the other hydrogen halides, HF is lighter than air and it is particularly penetrating, which can damage the lungs. Aqueous solutions of HF, called hydrofluoric acid, are strongly corrosive. HF forms orthorhombic crystals, consisting of zig-zag chains of HF molecules. The HF molecules, with a short H–F bond of 0.95 A, are linked to neighboring molecules by intermolecular H–F distances of 1.55 A.Liquid HF also consists of chains of HF molecules, but the chains are shorter, consisting on average of only five or six molecules.

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