N95 is produced according to American standards; FFP2 is according to European standard EN149; KN95 is the Chinese standard GB2626-2006 / 2019; All masks are qualified as long as they bear the N95, FFP2, KN95 remark. The protection level is expressed by
When making measurements on machine parts, engineers commonly measure area in square millimeters rather than square meters. If you follow this convention, you'll need the following conversion factor: 1 MPa = 0.001 kN/mm2 You can also do the operation in reverse. If you know the total force e...
Parts per billion (ppb) and parts per million (ppm) both measure very small concentrations of substances. Scientists convert from ppb to ppm sometimes, because some substances can exert noticeable and even drastic effects on the human body and other biological systems, such as plant life, even ...
How to quickly measure the MFR in the high-pressure polymerization of ethyleneEthylene in the process of forming an ethylene polymer by polymerizing the comonomers further ethylene or ethylene in a reactor at a pressure of 40MPa~350MPa and temperature of 140 ℃ ~350 ℃, is cooled in the ...
The strain guages measure the deflection of the stand, which is proportional to the weight. I have also seen tanks for several thousand gallons of product being weighed by using a balance. They rest on a platform (or stand) mounted on a long bar. The pivot point is close to the tank ...
As Martin Jukes says:“If your contact centre has a very low absenteeism rate of one or two percent, you may think that it’s not necessary to measure absence rates for separate teams. However, what you may find is that it’s one team that is causing almost all of that two percent ...
Conclusion. Psychometric properties of the new scale suggest good characteristics to measure short-term effects of sex-steroid hormones in women. The scale seems to be appropriate, feasible, interpretable, reliable, and valid for their application as PRO scale. 展开 ...
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The foot-pound and the inch-pound are two of many different units used to measure work and torque. These two customary units are equal to the force of 1 lb. acting through the distance of one foot and 1 lb. acting through the distance of one inch. Because both units are based on the...
How To Calculate CFMs. Your fan's expected blow rate can be calculated from the amount of power it consumes and the pressure at which it works. The calculation will determine the fan's CFM value -- meaning how many cubic feet of air it displaces each min