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hy·dro·gen ('hI-dr&-j&n)
n. Symbol H - A
colorless, highly flammable gaseous element, the lightest of gases
and
most
abundant element, used in
the production of synthetic ammonia and methanol, in petroleum refining,
in the hydrogenation of organic materials, as a reducing atmosphere,
in oxyhydrogen torches, and in rocket fuels. Atomic number 1; atomic
weight 1.00794; melting point -259.14°C; boiling point -252.8°C;
density at 0°C 0.08987 gram per liter; valence 1.