(mathematics) A function that gives the relative probability that a discrete random variable is exactly equal to some value.

The weighted average of the atomic masses of the naturally occurring isotopes of an element.

plural of active gravitational mass

plural of average atomic mass

plural of body mass index

plural of probability mass function

(physics, chemistry) Synonym of conservation of mass

(astronomy) A massive burst of solar wind, other light isotope plasma, and magnetic fields rising above the solar corona or being released into space.

plural of coronal mass ejection

plural of atomic mass unit