Pressure and it’s measurement | fluid mechanics | #civilengineering #fluidmechaics

This video provides a comprehensive overview of fluid pressure and its measurement techniques in the field of civil engineering. The key topics covered include: • Fundamental Laws of Fluid Mechanics: • Pascal's Law (0:29 - 2:01): States that pressure at any point in a static fluid is equal in all directions. It highlights that in a static fluid, shear stress and shear strain are zero. • Hydrostatic Law (2:03 - 4:06): Explains that the rate of increase of pressure in a vertical direction is equal to the weight density of the fluid at that point, leading to the fundamental formula P = rhogh. ain to the trianent frea a vertical direction is equal to the • Hydrostatic Paradox (4:07 - 5:23): Demonstrates that pressure depends only on the vertical height of the fluid column, regardless of the container's shape or size. • Practical Applications: • Hydraulic Jack (5:27 - 8:06): Explains how to use pressure principles to lift weights using different liquid levels. • Pressure Types (9:28 - 11:32): Discusses the relationship between Absolute, Gauge, Atmospheric, and Vacuum pressures. • Pressure Measurement Devices (11:36 - 20:41): • Manometers: Discusses various types, including simple Piezometers (12:21), U-tube manometers (14:05), and differential manometers (17:25) used for measuring pressure differences. • Mercury Usage (15:57 - 17:10): Explains why mercury is preferred in manometers due to its high density, low vapor pressure, and non-stick properties with glass. • Calculation Methods (20:42 - 26:08): • Outlines the Left/Right Limb method and the Jumping method to calculate pressure differences in manometers, emphasizing the sign convention: positive when moving downward and negative when moving upward.