ABSTRACT
Gases and liquids are generally termed as fluids. Under dynamic conditions, the nature of governing equations is the same for both gases and liquids. Hence, it is possible to treat them under the same heading, namely, fluid dynamics or fluid mechanics. The basic feature of a fluid is that it can flow, and this is the essence of any definition of it. When a fluid is in motion, the actual pressure exerted by the fluid in the direction normal to the flow is known as the static pressure. The pressure and temperature ranges in which this equation is applicable are 0.01 to 100 atm and 0 to 2000 K. For the same reason given for viscosity relation, the thermal conductivity also depends only on temperature. The kinematic viscosity coefficient is a convenient form of expressing the viscosity of a fluid.
