Unlimited journeyman HVAC tech here. In 15 years I’ve never once seen someone refer to a refrigerant charge by volume. Reason being 12 oz (volume) could weigh 16 oz or it could weigh 16 gramsOk. I guess in the automotive world, everything is charged to the customer by weight so I dont have the conection of volume and weight. It's all weight to my becuase that is what I worry about.
Sorry skyshaddow.
Now I know.