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# Unit 3-calculations

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• NOTE: engineering and other professions may use a different definition for NTP. Others use 20 degrees C, 1 atm. Use the hygiene NTP values 25 degrees C, 1 atm. STP = Standard temperature and pressure Temperature (0 o C) Pressure (1 atm)
• ### Unit 3-calculations

1. 1. UNIT 3 CONCENTRATION CONVERSION CALCULATION EXAMPLES HPEO 408 Occupational Health Hazards
2. 2. ppm ↔ mg/m 3 CONVERSIONS Where: MW = molecular weight of substance in g/mol 24.45 = molar volume of air in liters at normal temperature and pressure ( NTP ) NTP = Temperature (25 o C) Pressure (1 atm / 760 mm Hg) NOTE: if not NTP conditions molar volume may require adjustment
3. 3. EXAMPLE 1
4. 4. EXAMPLE 2