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.
Nummus: (Greek: Î½Î¿ÏÎ¼Î¼Î¯Î¿Î½, noummion), plural nummi (Î½Î¿á¿¦Î¼Î¼Î¿Î¹) is a Latin term meaning coin, but used technically by modern writers for a range of low-value copper coins issued by the Roman and Byzantine empires during Late Antiquity.