chemical measurement of pollution The quantitative determination of the presence, extent or type of pollutant substances in the environment by studying the actions or reactions of known chemicals to those pollutants
physical measurement of pollution The quantitative determination of the presence, extent or type of pollutant substances in the environment using mechanical means, including optical, electrical, acoustical and thermodynamic techniques
sound measurementBecause of the large variations in sound magnitudes, and because the human hearing sensation seems to vary in a logarithmic way, logarithms are used in measurement of sound. The sound pressure level is given in decibels (dB)
stream measurementThe quantitative determination of the rate and amount of flow or discharge from a natural body of running water, such as a small river or brook