The equilibrium of fluids was ascribed by Pascal to the principle of virtual velocities above mentioned. This principle or law of nature has been thus enunciated: “Forces in equilibrium must be ...

The Hardy-Weinberg equilibrium can be disturbed by a number of forces, including mutations, natural selection, nonrandom mating, genetic drift, and gene flow. For instance, mutations disrupt the ...

Most materials exist in an equilibrium state, meaning that the forces and torques on the material's atoms are all balanced. Glasses, however, are a famous exception: they are amorphous solid ...