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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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Q: Convert from Sm3 to Nm3
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