packaged unit
[EN 14511-1:2022, 3.42]:factory assembly of components of refrigeration system fixed on a common mounting to form a discrete unit.
Continue reading →Glossary Terms
parameter (in air pollution)
[EN 15665:2009, 3.3]:pollutant or marker that is used in the expression of a requirement.NOTE 1 More than one parameter may be used at the same time and combined.NOTE 2 Relative humidity, odours, CO2 are examples of parameters.
Continue reading →particle number concentration
[EN 12792:2003, 283]:number of particles per unit of volume of the test air
Continue reading →particulate matter
[ISO 16814:2008, 3,32]:solid or liquid particles in air, typically in the size range 0,01 μm to 100 μm in diameter.NOTE PM10 is particulate matter smaller than 10 μm in aerodynamic diameter.
Continue reading →particulate tracer
[AIVC, Air infiltration and ventilation glossary, 1992]:solid particles of aerosol or bubbles used as a tracer for measuring the rate of air movement. These particles usually have diameters of 2 to 3 microns, and can be detected by using either … Continue reading →