Fluid mechanics is an important subject taught in many engineering departments. It involves the study of fluids at rest and in motion, and is relevant to various fields like mechanical engineering. The document provides examples of fluid mechanics applications in everyday life like flags waving in the wind and blood flow. It also gives technical examples involving concepts like viscosity, velocity profiles, and converting between temperature scales. Methods and calculations are demonstrated for changing between Fahrenheit, Celsius, and Kelvin temperature scales.