Is anyone mixing gases by weight? This was the realm of commercial gas plants when I started in the 1970s because the scales were so expensive the technique was of little value offshore.
However, you can buy a 50 Kg/110 Lb scale that is +/- 20 grams for $50 now. I may have made a quick math error but with Oxygen at 40.465882512 Grams/Ft³ it seems that would be accurate enough for home-brew mixing onshore anyway. This strikes me as less expensive and more accurate than PP mixing with a precision pressure gauge and is less temperature sensitive.
Sorry if the subject was covered already, but couldn't find it on a search.
However, you can buy a 50 Kg/110 Lb scale that is +/- 20 grams for $50 now. I may have made a quick math error but with Oxygen at 40.465882512 Grams/Ft³ it seems that would be accurate enough for home-brew mixing onshore anyway. This strikes me as less expensive and more accurate than PP mixing with a precision pressure gauge and is less temperature sensitive.
Sorry if the subject was covered already, but couldn't find it on a search.