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.
Medical Definition of Fundus. Fundus: In medicine, the bottom or base of an organ. For example, the fundus of the eye is the retina. However, the fundus of the stomach is inexplicably the upper portion. From the Latin for 'the bottom.'.