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Terms starting with U
Definition
“Particles in the atmosphere that have diameters generally less than 0.1 micrometer (μm). UFP are created by
combustion processes and chemical reactions in the atmosphere.”
Uncertainty of measurement refers to the inherent variability or doubt associated with the result of a measurement. It reflects the range within which the true value of the quantity being measured is likely to lie. This uncertainty takes into account various factors, including instrument limitations, calibration errors, statistical variations, and environmental conditions, which can affect the accuracy and reliability of a measurement. Expressing uncertainty is crucial in scientific and metrological contexts to provide a realistic and comprehensive understanding of the precision and accuracy of a measurement result.
Also referred to as under-report. Sensor measurements are lower than the reference monitor measurements.
Where air moves through before it goes over an area of interest.
