The siphon controversy counterpoint: the brain need not be "baffling".

Abstract

The flow of liquids in a system of tubes is subject to three possible forces: 1) gravitational, 2) accelerative, and 3) viscous. The physical laws describing the first two forces were elucidated by Swiss mathematician Daniel Bernoulli (1700–1782) in Hydrodynamica (4) and is described by the following equation: (1) where E_tot equals the total energy of the fluid, PΔV represents pressure energy per unit volume, ρgh is gravitational potential (elevational) energy per unit volume (ρghΔV), and (1/2ρv²ΔV) is kinetic energy per unit volume. Although a powerful equation, an additional factor that influences the flow of liquids, the role of viscous resistance, must be considered.