Roger Bacon summary
Below is the article summary. For the full article, see Roger Bacon.
gunpowder Summary
Gunpowder, any of several low-explosive mixtures used as propelling charges in guns and as blasting agents in mining. The first such explosive was black powder, which consists of a mixture of saltpetre (potassium nitrate), sulfur, and charcoal. When prepared in roughly the correct proportions (75
light Summary
Light, electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10−11 metre to radio waves measured in metres. Within that broad spectrum the wavelengths
alchemy Summary
Alchemy, a form of speculative thought that, among other aims, tried to transform base metals such as lead or copper into silver or gold and to discover a cure for disease and a way of extending life. Alchemy was the name given in Latin Europe in the 12th century to an aspect of thought that
optics Summary
Optics, science concerned with the genesis and propagation of light, the changes that it undergoes and produces, and other phenomena closely associated with it. There are two major branches of optics, physical and geometrical. Physical optics deals primarily with the nature and properties of light