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Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
Atmospheric pollutant concentrations expressed as mass per unit volume of atmospheric air (e.g., mg/m 3, μg/m 3, etc.) at sea level will decrease with increasing altitude because the atmospheric pressure decreases with increasing altitude.
M2 is the most widely used industrial HSS. It has small and evenly distributed carbides giving high wear resistance, though its decarburization sensitivity is a little bit high. After heat treatment, its hardness is the same as T1, but its bending strength can reach 4,700 MPa (680,000 psi), and its toughness and thermo-plasticity are higher ...
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).
Dimensionally the M2 series are similar to the original PPS variants. The PPS M2 features a push button magazine release, front and rear slide serrations and a redesigned grip. The PPS M2 has a trigger travel of approximately 6 mm (0.2 in) and a trigger pull of approximately 27 N (6.1 lb f). The PPS M2 is also available in an LE edition with ...