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This book presents select proceedings of the International Conference on Advances in Fluid Flow and Thermal Sciences (ICAFFTS 2021) and summarizes the modern research practices in thermal sciences and engineering. The content of book involves advanced topics in heat transfer science, automobile, refrigeration and air conditioning, cryogenics, non-conventional systems and energy storage. Topics on cutting edge research in the area of hybrid nano-PCM-based systems, solar-based applications, bio-diesel and nano additives-based combustion, fuel cell and thermoacoustic engine are also included. In...

Plethysmography is a technique of measuring volume changes of an organ, the volume may be due to blood, water or air. It is of many types like Photo electric Plethysmography, Pneumo ( Body or Chamber ) Plethysmography, Inductive Plethysmography, Impedance Plethysmography, Magnetic Susceptibility Plethysmography, Body Plethysmography, Strain Gauge Plethysmography2-5. We are mainly concerned with IMPEDANCE PLETHYSMOGRAPHY that measures volume changes of blood in chest, calf or any other region of the body by sensing electrical resistance changes in respective area.