The phrase "REFPROP 91 free" typically implies a desire to obtain the software without purchasing a license. It is imperative to clarify that REFPROP is not public domain software; it is a commercial product sold by NIST. While NIST is a government agency, the distribution of REFPROP is managed under specific statutory authority that allows for the charging of fees to recover development costs.
The phrase "REFPROP 91 free" typically implies a desire to obtain the software without purchasing a license. It is imperative to clarify that REFPROP is not public domain software; it is a commercial product sold by NIST. While NIST is a government agency, the distribution of REFPROP is managed under specific statutory authority that allows for the charging of fees to recover development costs.