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User Name Thread Name Subject Posted
Nigel Parsons BS: Language Pet Peeves (1645* d) RE: BS: Language Pet Peeves 01 Nov 20



Subject: RE: BS: Language Pet Peeves
From: Mrrzy
. . .
Newly discovered Triassic lizard could float underwater to pick off prey ... Well, if it is floating, it is not *under*water, now, is it?


Well, actually, they can be 'floating'. It just means that they do not need to regulate the depth of their dive. Floating is being in a state of suspension due to the upthrust of the medium one is in matching the downthrust of ones weight/mass. Or, as our physics teacher had us memorise:
"When a body is wholly or partially immersed in a liquid or fluid it receives an upthrust equal in force to the mass of liquid or fluid displaced."
Hope I got that right, it's 50 years ago now, and a quote (in translation) of Archimedes.
Divers use weighted belts to offset the floatation effect of the sea-water surrounding them.


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