Some power process can be designed in any point of the space by means of energy transformation. Some Definitions 1. In physics it is scalar parameter. Gradient of potential is intensity of some field.
Field is area of action for some force.
Work is quantitative description for energy transformation. Quantity of work per unit of time is power. It is possible to consider some motion from the moment C A to the moment C B . But it is not direction in space but gradient for direction in time, the chronal gradient. This potential difference can be named as chronal pressure.