zMEEN 30123: FLUID MECHANICS by: Sir Garry Cahibaybayan zIn this lesson we will: Define fluid mechanics Discuss mass, weight and pressure scale Discuss density, specific volume, specific weight and specific gravity. Discuss Viscosity( dynamic and kinematic viscosity) z Introduction: Fluid - any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest and that undergoes a continuous change in shape when subjected to such a stress. z z Actual surface Imaginary surface A solid can resist shear stress A solid can not resist shear stress Bottom line: A fluid at rest cannot resist shear stress z z z Dimension and System of Units z In this lesson, we will: Discuss the difference between dimensions and units Demonstrate the proper way to do unit conversions using unity conversion ratios. z Dimension – (eg. Length) Units – (eg. meter) Unity Conversion Ratios: Examples: ( 12in/ft) , (60s/min) , ( 1kg/ 2.20462) z Example: z z z Accuracy and Precision: z z z In this lesson, we will: Define density and relative properties, specific gravity and specific weight Discuss how to calculate density when applying the ideal gas approximation z z