Mudcat Café Message Lyrics & Knowledge Personal Pages Record Shop Auction Links Radio & Media Kids Membership Help
The Mudcat Cafeawe

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.

Post to this Thread -

Back to the Main Forum Page

By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.

By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
   * Click on the linked number with * to view the thread split into pages (click "d" for chronologically descending).

By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.

By clicking on the Date (Posted), you will dig out every message posted that day.

Try it all, you will see.