Scientific Notation and Engineering Notation

the difference is in what restrictions are placed upon the various 
numbers.

   Example:  -14778.21 
  
   Scientific Notation:  -1.477821 x 10^4
   This number is of the form A x 10^p, where A is between 1.0 and
   10.0 (or between -1.0 and -10.0), and p is an integer.

   Engineering Notation:  -14.77821 x 10^3
   This number is of the form A x 10^p, where A is between 1.0 and
   1000.0 (or between -1.0 and -1000.0), and p is a multiple of 3.

   Example:  75000

   Scientific Notation: 7.5 X 10^4

   Engineering Notation: 75 X 10^3