What do those stand for? I was looking on some of the common sized ones, and the TW was about 18 - 17.5, 18.9, etc. The WC was closer to 48. Most of the places exchanging tanks here only put in 17-18 pounds which is much less than the tank would hold if the WC is the weight charged, or weight of charge.

I have a smaller tank marked TW 10.5 and WC 10.2. It weighs 14 pounds now part full.

What do those stand for? I was looking on some of the common sized ones, and the TW was about 18 - 17.5, 18.9, etc. The WC was closer to 48. Most of the places exchanging tanks here only put in 17-18 pounds which is much less than the tank would hold if the the WC is the weight charged, or weight of charge.

I have a smaller tank marked TW 10.5 and WC 10.2. It weighs 14 pounds now part full.
... Tare Weight (Tank empty) and WC for Water Capacity (maximum propane capacity is about 80% of WC).