But convection currents are ultimately at the mercy of temperature differences because these are what create pressure differences in the first place. The pressure difference between two locations is called a pressure gradient, and the force that actually moves air as wind is called the pressure gradient force.
oÂ·nus. n. 1. A difficult or disagreeable responsibility or necessity; a burden or obligation. 2. Responsibility for an error or fault; blame: Each side wants to avoid the onus of having started the disagreement. 3.
manus - the (prehensile) extremity of the superior limb; he had the hands of a surgeon; he extended his mitt. hand, mitt, paw. human, human being, homo, man - any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage.