Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 7000100794000000000♠1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol ¹H), has one proton and no neutrons.

The universal emergence of atomic hydrogen first occurred during the recombination epoch. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas with the molecular formula H₂. Since hydrogen readily forms covalent compounds with most non-metallic elements, most of the hydrogen on Earth exists in molecular forms such as in the form of water or organic compounds. Hydrogen plays a particularly important role in acid–base reactions as many acid-base reactions involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) when it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol H⁺. The hydrogen cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds are always more complex species than that would suggest. As the only neutral atom for which the Schrödinger equation can be solved analytically, study of the energetics and bonding of the hydrogen atom has played a key role in the development of quantum mechanics.

Hydrogen is an advanced drum machine created by Alessandro Cominu, an Italian programmer who goes by the pseudonym Comix. Its main goal is to provide professional yet simple and intuitive pattern-based drum programming.

Hydrogen was originally developed for Linux, but later ported to Mac OS X. Support for Microsoft Windows seemed to have been abandoned, since the last build dated to 2006 for 4 years, but a Microsoft Windows port exists as a snapshot of the upcoming 0.9.6 version, indicating that the operating system is likely to be supported in the future. The graphical user interface for the application uses Qt library. All code is released under the GNU General Public License. Hydrogen is free software.

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Hydrogen was a champion Australian thoroughbred racehorse.

By the imported stallion Delville Wood (who also sired Melbourne Cup winner Evening Peal) he was foaled in 1948 and was trained throughout his career by Ted Hush.

Hydrogen failed by a neck of being the first horse to win three Cox Plates when beaten in 1951 as a three-year-old. He won the subsequent two editions of the race in 1952 and 1953.

An outstanding three-year-old he developed into one of Australia’s finest weight-for-age performers and the highest stakes earner at the time eclipsing the record previously held by Phar Lap.

A winner over six furlongs (1,200m) to two miles (3,200m) he won many major races including the 1951 VATC Caulfield Guineas, 1951 VRC Victoria Derby, 1951 STC Rosehill Guineas, 1951 AJC Craven Plate, the 1952 and 1953 MVRC W.S. Cox Plate, 1953 VRC LKS Mackinnon Stakes and the 1953 QTC Brisbane Cup.

He was retired to stud in 1954.

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