HOW TO CONVERT M3/hr.( CUBIC METER PER HOUR) TO Nm3/hr. (NORMAL CUBIC METER PER HOUR)?
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CONVERT M3/hr TO Nm3/hr
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Normalising any measurement requires that the STP (standard temperature and pressure) values be defined 1st as they are often different for different countries ie
USA
Tref = 20 or 25 degC (depending on the measurement standards)
Pref = 29.92 inHg
Europe, Australia, NZ, UK
Tref = 273.15 degK = 0 degC
Pref = 1013 hPa
Converting raw m3/hr to Nm3/hr is a simple application of Charles Law multiplying ratios of true and ref Temp and Pressure values as follows.. we can ignore the hr term as it is applied throughout
if m3=1 and Pactual=1025hPa and Tactual=21degC
Nm3 = m3 x Pactual/Pref x (273.15+Tref)/(273.15+Tactual)
Nm3 = m3 x Pactual/1013 x (273.15+0)/(273.15+21)
Nm3 = 1 x 1025/1013 x 273.15/294.15
Nm3 = 1 x 1.01185 x 0.92861
Nm3 = 0.939 m3
USA
Tref = 20 or 25 degC (depending on the measurement standards)
Pref = 29.92 inHg
Europe, Australia, NZ, UK
Tref = 273.15 degK = 0 degC
Pref = 1013 hPa
Converting raw m3/hr to Nm3/hr is a simple application of Charles Law multiplying ratios of true and ref Temp and Pressure values as follows.. we can ignore the hr term as it is applied throughout
if m3=1 and Pactual=1025hPa and Tactual=21degC
Nm3 = m3 x Pactual/Pref x (273.15+Tref)/(273.15+Tactual)
Nm3 = m3 x Pactual/1013 x (273.15+0)/(273.15+21)
Nm3 = 1 x 1025/1013 x 273.15/294.15
Nm3 = 1 x 1.01185 x 0.92861
Nm3 = 0.939 m3
Source:
Been doing this everyday for 19yrs
Other Answers (1)

A normal cubic meter (Nm³) is the metric expression of gas volume at standard conditions and it is usually defined as being measured at 0°C and 1 atmosphere of pressure.
So you need to know the temperature and pressure conditions of the gas if you want to convert to "normal cubic meter".
PS, M is never used as an abbreviation for meter. Only m is used.
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