"DerbyDad03" wrote in message
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On Jul 3, 10:08 am, "jack" wrote:
The barbeque sized ones; about how much are they full and empty?

Just curious - why do you want to know?

Really - just curious - the answer could be interesting.
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I had two tanks in my garage. They felt too heavy to be empty, but not
heavy enough to be full. Turns out my "arm scale" is wrong; the bathroom
scale says they are empty.
Full now.