Does Bernoulli’s principle refer to changes in internal pressure of a fluid or to pressures the fluid may exert on objects?
ANSWER: Bernoulli’s principle tells that, if there is a decrease in pressure or decrease in a fluid’s potential energy, then the speed of the fluid increases instantaneously. In the above relation between the pressure and speed, it is referred to the internal pressure of the liquid. The change in speed depends on the internal pressure of the liquid not the pressure exerted by the fluid on objects.