0 ratharenu

0.00024414

The above number put in fractional form is 1 / 4,096. One atom is considered 1 / 4,096 of a ratharenu. A ratharenu is the smallest particle of dust you can see in a sunbeam. The term for the modern atom was paramanu. Analysis of matter in the Abhidhamma was taken all the way down to this level.

References

• The Complete Book of Buddha's Lists -- Explained. David N. Snyder, Ph.D., 2006.
• http://www.thedhamma.com/