Definition: Hoydening is a mathematical concept in fluid dynamics, specifically used to describe the effect of temperature on the flow of gas or liquid. It is named after the Swedish physicist and engineer, Rolf Hoyden. The Hoydening effect occurs when a small perturbation in the velocity field of a gas or liquid causes it to move faster through the medium due to the force of gravity. This movement can be seen as a "hoydening" of the fluid flow, where a small
what should be said.