microstate

micro- +‎ state

microstate (plural microstates)

1. A country that has a very small population and land area.
2. (physics) The specific detailed microscopic configuration of a system.
   • 1989, H. E. Avery, ‎D. John Shaw, Physical Chemistry (page 33)

     However, the number of microstates in which the excess of molecules in one bulb over the number in the other bulb is sufficient to permit the measurement of a pressure difference is a quite discountably small fraction of the total number of microstates.

• (physics): macrostate

• microstate continuum

• tetrasomic