Physical effects are the way of converting one set of physical quantities into another set, or producing one set of physical quantities from the other one:
(PQ1out, … ,PQnout) = F(PQ1in, … ,PQmin),
where PQiin is the i-th input physical quantity and PQjout is the j-th output physical quantity.
For example, Hall effect converts electric current I in a conductor of width W with charge carrier density of D and magnetic field B across it into a voltage difference V across the conductor:
V = - IB/DWe,
where e is the elementary charge.
Here PQ1in = I, PQ2in = B, PQ3in = D, PQ4in = W, and PQ1out = V.
Physical effects can be classified in various ways:
Classification 1), 2), and 3) are trivial and, in fact, were already partially accomplished by various encyclopedia. Classification of effects by the type of the dependence between inputs and outputs is less obvious and so far has been accomplished by no one. This article is an attempt to fill in this gap and present excerpts from the classification of the latter type.
There are tons and tons of them. I will only list those, which are needed to contrast stepwise dependencies between the same inputs and outputs. Specifically:
(It would be interesting to discover an effect of a stepwise volume change without a phase transition, though. Who can pick up this challenge?)
R E F E R E N C E S: