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Four concrete cases:
1) 1 cc of lead is suspended on a fine thread in air
lead scale shows 11.3 gm (using lead density = 11.3 gm/cc)
Scale under brimming full aquarium reads x gm
2) 1 cc of lead is suspended at mid water depth
lead scale reads 10.3 gm ( using water density of 1 gm/cc)
scale under aquarium reads x gm)
3) 1 cc of lead rests on sandy bottom of aquarium.
lead scale reads 0 gm
Aquarium scale reads x + 10.3 gm
4) edges of 1 cc cube of lead are sealed to the aquarium floor excluding
all water beneath.
Lead scale reads 0 gm
Aquarium scale reads x + 10.3 gm
Floor Plate stress distributions:
Case 1&2) uniform area loading.
Case 3&4) increased area loading under cube, area loading elsewhere
unchanged .
(How am I doing?)