Quote:
Originally Posted by Brian Carlton
AFAIK, the measurement of the can is in fluid ounces.
If so, the conversion shows that R-12 weighs .1 lb/fluid ounce.
If you need 2.9 lb. of the fluid, that would equate to 29 fluid ounces, or about 2.5 cans.
If I am correct with this theory, you're overcharged.
Maybe John can chime in..............
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It's my understanding that refrigerant is always measured by weight (mass), not volume. Since refrigerant is packaged and shipped in liquid form, but dispensed as a gas (which is difficult to measure given varying densities as a result of varying temperatures and pressures, it is much easier to measure it by weight. Every A/C refrigerant sticker I've seen on a car identifies the required refrigerant amount in either pounds, kilograms, or sometimes both.
Refrigerant cylinders are always measured by weight, i.e. a 30 pound cylinder of R12 likely weighs 30 pounds full, but about 7 pounds empty, so the cylinder would be said to contain about 23 pounds of R12.
Additionally, the cans I used were specifically marked "Net Weight 12 Oz." not 12 FL OZ, so they are clearly being measured by weight.
Below is a picture of the cans for reference.