Civil and Environmental Engineering 2224 Study Guide - Quiz Guide: Ideal Gas Law, Pressure Measurement, Lapse Rate
3 Apr 2017
School
Department
Professor
Document Summary
In open bodies of water, pressure at the surface is chosen to be 0, so the surface atmospheric, Pa pressure becomes the reference pressure point p2 is at h distance below the surface (h is positive: z is the vertical direction. The differential pressure in any direction is dp= - (cid:591)axdx - (cid:591)aydy - (cid:591)(cid:4666)az+g(cid:4667)dz. Using the ideal gas law and integrating between sea level and elevation z: Generally (not always) these changes are neglected as they are so small: Density is dependent on height; in the troposphere (lowest part) temperature varies linearly. Study of fluids with no relative motion between fluid particles: no shear stress, only normal stress present, so primarily looking at pressure. Pascal"s law pressure at a given point is the same in all directions in a static fluid, or in a fluid in motion in the absence of shear stress.
