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... what is the weight of a frog floating just under the surface of a pond. If you remember "Bob's Rules" that I set up a few hundred postings ago, the weight is what a scale glued to the frog's feet would read.
Since the scale probably won't float, it might actually give a negative reading, depending on its construction. Those on the list who insist on using weight as mg would then have to attribute a negative mass to the frog - sort of an "anti-frog".