The chemical potentials are clearly functions of the composition of the system, and of its temperature and pressure.
Observations on mountain tops generally show high potentials near the ground.
Instead of calculating the direction and magnitude of the resultant force on each particle arising from the action of neighbouring particles, he formed a single expression which is the aggregate of all the potentials arising from the mutual action between pairs of particles.
Suppose it is required to measure the difference of potentials V and V' of two conductors.
If W is the weight required to depress the attracted disk into the same sighted position when the plates are unelectrified and g is the acceleration of gravity, then the difference of potentials of the conductors tested is expressed by the formula V - V'=(d - d') /87 W where S denotes the area of the attracted disk.