Effective mass may refer to:
- Effective mass (solid-state physics), a property of an excitation in a crystal analogous to the mass of a free particle
- Effective mass (spring-mass system)
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Famous quotes containing the words effective and/or mass:
“Before anything else [Numa] decided that he must instill in his subjects the fear of the gods, this being the most effective measure with an ignorant, and at that time uncultured, people.”
—Titus Livius (Livy)
“After the planet becomes theirs, many millions of years will have to pass before a beetle particularly loved by God, at the end of its calculations will find written on a sheet of paper in letters of fire that energy is equal to the mass multiplied by the square of the velocity of light. The new kings of the world will live tranquilly for a long time, confining themselves to devouring each other and being parasites among each other on a cottage industry scale.”
—Primo Levi (1919–1987)