Business / Machine Shop / Hydrogen: The lightest chemical element, colorless, odorless and tasteless. It is found in combination with other elements in most organic compounds and many inorganic compounds. Hydrogen combines readily with oxygen in the presence of heat and forms water.

Hydrogen (H)

Science / Periodic Table of Elements / Hydrogen (H): Atomic number: 1, Atomic mass: 1.007825 g.mol -1, Electronegativity: 2.1, Density: 0.0899*10 -3 g.cm -3 at 20 °C, Melting point: - 259.2 °C, Boiling point: - 252.8 °C, Vanderwaals radius: 0.12 nm, MORE

Standard Hydrogen Electrode

Science / Chemistry / Standard Hydrogen Electrode: A platinum electrode that runs the half reaction 2 H+(aq, 1M) + 2 e- rightarrow H2(g, 1 atm), chosen as a reference for cell voltages. The electrode potential of the standard hydrogen electrode is def MORE

Hydrogen Bond

Science / Biology / Hydrogen Bond: A weak bond between two atoms (one of which is hydrogen) with partial but opposite electrical charges. MORE

Hydrogen Peroxide

Entertainment / Photography / Hydrogen Peroxide: Chemical used in hypo clearing agents. MORE


Health / Dentistry / Bleaching: The technique of applying a chemical agent, usually hydrogen peroxide, to the teeth to whiten them. MORE


Business / Agriculture / Ph: An expression of the intensity of the basic or acidic condition of a liquid or of soil: the logarithmic scale ranges from 0 to 14, where 0 is the most acid, 7 is neutral, and above 7 is alkaline. Natu MORE