Hydrogen
- Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.
Hydroelectricity
- Hydroelectricity is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all renewable electricity, and was expected to increa
Hydrocodone
- Hydrocodone, sold under the brand name Hysingla among others, is an opioid used to treat severe pain of a prolonged duration, if other measures are not sufficient.
Hydrogen peroxide
- Hydrogen peroxide is a chemical compound with the formula H2O2. In its pure form, it is a very pale blue, clear liquid, slightly more viscous than water.
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