SFPE Handbook of Fire Protection Engineering

B. S. Kandola
Dr. B. S. Kandola, formerly a member of the unit of fire safety engineering, Edinburgh University, and a senior consultant with AEA Technology and Lloyd's Register, is an independent safety and risk management consultant. He has worked on a range of research projects involving fire and smoke movement modeling on offshore oil and gas installations and for the nuclear industry. His current activities include risk assessment, consequence modeling, hazard analysis, and the development of safety cases for the petrochemical, offshore, and nuclear industries.
A fluid is defined as a substance that has the capacity to flow freely and as a consequence deform continuously when subjected to a shear stress. A fluid can be either a liquid, a vapor, or a gas.
For the purposes of fluid flow studies, a very important distinction is made between compressible fluids and incompressible fluids. In general, the compressibility effects of liquids are so small that they can be regarded as incompressible, whereas gases and vapors can be either compressible or incompressible depending on the forces involved.
To simplify analytical investigation of fluid motion, the intermolecular forces of the...