Science

Science

3Categories 125694Terms

Add a new term

Contributors in Science

Become a Contributors

Science > General science

light-emitting diode

Science; General science

A rectifying semiconductor device which converts electrical energy into electromagnetic radiation. The wavelength of the emitted radiation ranges from the near-ultraviolet to the ...

anemia

Science; General science

A reduction in the total quantity of hemoglobin or of red blood cells (erythrocytes) in the circulation. Because it generally is impractical to measure the total quantity, ...

tidal datum

Science; General science

A reference elevation of the sea surface from which vertical measurements are made, such as depths of the ocean and heights of the land. The intersection of the elevation of a ...

kerosine

Science; General science

A refined petroleum fraction used as a fuel for heating and cooking, jet engines, lamps, and weed burning, and as a base for insecticides. Kerosine, known also as lamp oil, is ...

domain (electricity and magnetism)

Science; General science

A region in a solid within which elementary atomic or molecular magnetic or electric moments are uniformly aligned.

shadow

Science; General science

A region of darkness caused by the presence of an opaque object interposed between such a region and a source of light. A shadow can be totally dark only in that part called the ...