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
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