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post #8 of Old 04-20-2013
SlowButSteady
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Re: 100 lb of Lead Vs 100 lb of concrete

Think of it this way:

1000 liters of sea water: apparent weight in air = 1025 kg; apparent weight in seawater = 0 kg
1000 liters of concrete: apparent weight in air = 2400 kg; apparent weight in seawater = 1475 kg
1000 liters of iron: apparent weight in air = 7874 kg; apparent weight in seawater = 6849 kg
1000 liters of lead: apparent weight in air = 11340 kg; apparent weight in seawater = 10315 kg

- apparent weight in seawater is (density*volume) - (seawater density*volume);
- numbers are approximate, depending on salinity and the concrete mix;
- apparent weight in air and apparent weight in a vacuum are virtually identical, as air has a density of only about 1.3 kg/1000 liters)

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Last edited by SlowButSteady; 04-20-2013 at 09:21 PM.
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