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Spectrum associated with emission of electromagnetic radiation by atoms (or other species) resulting from electronic transitions from higher to lower energy states.

 

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Radiation

High energy particles or rays emitted during the nuclear decay processes.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

Lanthanides

Elements 58 to 71 (after lanthanum).

Homonuclear

Consisting of only one element.

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Differential Scanning Calorimetry (DSC)

A technique for measuring the temperature, direction, and magnitude of thermal transitions in a sample material by heating/cooling and comparing the amount of energy required to maintain its rate of temperature increase or decrease with an inert reference material under similar conditions.

Manometer

A two-armed barometer.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Cathodic Protection

Protection of a metal (making ir a cathode) against corrosion by attaching it to a sacrifical anode of a more easily oxidized metal.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.