Unit conversion of methanol exposure limit
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According to GBZ2.1-2007, the occupational health exposure limit for methanol is 50 mg/cubic meter. However, many of the current monitoring instruments (mostly imported) use PPM as the unit of measurement; thus, there is a problem related to unit conversion. Can this conversion be carried out? Using the molecular weight of methanol, which is 32, the conversion to PPM would be 50/32×22.4, resulting in 35? Please ask fellow travelers for advice
PPM means one part per million, so you can calculate it now, right?
The value of the denominator is calculated based on the density of the air; once the value of the numerator is determined, the result is obtained. I don’t see any discrepancies
lyhh9024, moderator, could you explain the correction values in more detail?
This is the algorithm assuming standard conditions of 35 ppm
This is the conversion formula at 1 atmosphere and 0 degrees Celsius; in actual conversions, the correction factor of (273/273+T) × (P/101325) results in a minimal difference.