Terminal velocity in the presence of buoyancy force Settling velocity W s of a sand grain (diameter d, density 2650 kg/m 3) in water at 20 Â°C, computed with the formula of Soulsby (1997). When the buoyancy effects are taken into account, an object falling through a fluid under its own weight can reach a terminal velocity (settling velocity) if the net force acting on the object becomes zero.
Definition of poorâmouth. 1  intransitive verb. : 2  to plead poverty as a defense or excuse. 3  transitive verb. : 4  to speak disparagingly of.
Dry mouth is commonly associated with periodontal disease, as saliva helps prevent the growth of harmful bacteria in the mouth, which causes gum disease, oral infections, and tooth decay. Dry mouth, if not treated, can make chewing, eating, swallowing, and even talking difficult.