Pârsang "a make-weight," from pâr-, a variant of pâd-,
→ counter-, + sang a variant of sanj, sanjidan
"to measure; compare, put in balance," → object; alternatively,
pârsang "a piece of stone,"
from pâr, short for pâré "piece, part," + sang,
→ stone, meaning "weight."

mean molecular weight

وزن ِ مولکولی ِ میانگین

vazn-e molekuli-ye miyângin (#)

Fr.: poids moléculaire moyen

The total atomic or molecular weight divided by the total number of
particles. For instance, the mean molecular weight of a plasma of pure
ionized ^{4}He would be 4 (the atomic mass number) divided by 3, the
total number of particles (1 nucleus plus 2 electrons), i.e.
4/3.

1) Statistics: A number assigned to each value or range of values of a
given quantity, giving the number of times this value or range of
values is found to be observed.
2) Statistical mechanics: A multiplicative factor in
the expression for the probability of finding a system in a given
quantum state. Usually the number of degenerate substates
contained in the state.

The phenomenon experienced by a body when there is no force of reaction on it.
This happens when the body is in → free fall in a
→ gravitational field or when the net force on it is zero.

From → weight + -less suffix meaning "without"
+ -ness a suffix of quality or state.