In chemistry and biology, the extinction coefficient can refer to the mass attenuation coefficient or the molar absorptivity, which both relate to calculations of how different substances absorb light wavelengths. In phy... More »

The heating and cooling of the earth, changes in sea level, asteroids, acid rain and diseases can all be natural factors that cause a species to become extinct. Humans can also be the cause of extinction for certain spec... More »

Most extinctions can be prevented by implementing conservation strategies such as legal remedies, preserving natural plant and wildlife habitats and using synthetic medicines not derived from plant and animal products. P... More »

In chemistry, an activity series is a list of substances ranked by their relative activity. This series is helpful in determining oxidation numbers in oxidation-reduction reactions as well as predicting the products of m... More »

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A closed system in chemistry refers to a type of a thermodynamic system in which mass is conserved inside the system but energy enters and leaves the system freely. When both energy and matter can be exchanged between th... More »

Heating to constant mass is a gravimetric technique in analytical chemistry used to determine the mass of an evolved product relative to the initial mass of unreacted material. The technique requires the production of a ... More »

The law of octaves in chemistry is a generalization of a correspondence between chemical properties and atomic weight, in which different elements with similar chemical properties are usually separated by some multiple o... More »