Browse Reference Articles
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Electromagnetic spectrum
The electromagnetic spectrum is the range of all possible electromagnetic radiation. Above infrared in frequency comes visible light. This is the range in which the sun and stars similar to it emit ... > more -
Computer worm
A computer worm is a self-replicating computer program. It uses a network to send copies of itself to other nodes (computer terminals on the network) and it may do so without any user intervention. ... > more -
Nanotechnology
Nanotechnology refers broadly to a field of applied science and technology whose unifying theme is the control of matter on the molecular level in scales smaller than 1 micrometre, normally 1 to 100 ... > more -
Quantum tunnelling
Quantum tunnelling (or tunneling) is the quantum-mechanical effect of transitioning through a classically-forbidden energy state. Consider rolling a ball up a hill. If the ball is not given enough ... > more -
Phosphorus
Phosphorus is the chemical element in the periodic table that has the symbol P and atomic number 15. Phosphorus is commonly found in inorganic phosphate rocks and in all living cells. The most ... > more -
Spectroscopy
Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency. Spectroscopy is often used in physical and analytical chemistry for the identification of ... > more -
Fluid dynamics
Fluid dynamics is the subdiscipline of fluid mechanics that studies fluids (liquids and gases) in motion. The discipline has a number of subdisciplines, including aerodynamics (the study of gases) ... > more
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