C15

Cubic 1/1000th of inch < 131,099,300,000,000,000,000 X
  or 131 million million million molecules

Again
Cubic 1/10000th of inch = 1/103 cubic 1/1000th inch
      = 1/100 of cubic 1/1000th inch

∴ Cubic 1/10000th inch  > 16,386,170,000,000 X
      or 16 million million
   & > 13,109,930,000,000,000
      or 13,109 million million
(Final & Best)
Result.
A cubic 1/1000th of an inch contains between 16 thousand million million, & 131 million million million molecules
And a cubic 1/10000th of an inch contains between 16 million million and 131 thousand million million molecules

Bacterium [timed] is 1/40,000 of inch in diameter, one of smallest inf — animals
Blod-corpusle 1/3200 of inch