Both have applications in gas volume measurements.
Nm3 is "Normal cubic meter"
"Normal" is a set pressure and temperature which (just to make things difficult) differs between industries.
Sm3 is"Standard cubic meter", a volume unit of measurement defined as follows: "Cubic meter at a temperature of 15° Celsius and a pressure of 101.325 kPa (Kilopascal)".
So, to perform the conversion, you will have to take into account the industry definition of "Normal" and compute Sm3 using Dalton's gas laws.
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