Moore's Law

Moore's Law /morz law/ prov.  The observation that the
   logic density of silicon integrated circuits has closely followed
   the curve (bits per square inch) = 2^((t - 1962)) where
   t is time in years; that is, the amount of information storable on
   a given amount of silicon has roughly doubled every year since the
   technology was invented.  See also {Parkinson's Law of Data}.