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Philips Reference Libraries

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Compact Disc
2010-10-14 16:40:34

A Compact Disc, or CD, is an optical disc used to store digital data although it was originally developed to store sound recordings exclusively. Audio CDs have been available commercially since October 1982 and were popular until around 2010 when other digital forms took over. The standard CD can hold up to 80 minutes of uncompressed audio. There are also Mini CDs that hold up to 24 minutes...

Word of the Day
tesla
  • The unit of magnetic flux density in the International System of Units, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second. It is equivalent to one weber per square meter.
This word is named for Nikola Tesla, the inventor, engineer, and futurist.