In chemistry, the path length is defined as the distance that light (UV/VIS) travels through a sample in an analytical cell. Typically, a sample cell is made of quartz, glass, or a plastic rhombic cuvette with a volume typically ranging from 0.1 mL to 10 mL or larger used in a spectrophotometer. For the purposes of spectrophotometry (for example when making calculations using the Beer-Lambert law) the path length is measured in centimeters (rather than in meters). In a computer network, the path… (More on Pathlength)