According to Bernoulli's principle, what happens to the pressure of a fluid when it accelerates?

According to Bernoulli's principle, as the speed (or velocity) of a fluid increases, the pressure within that fluid decreases. This is a key concept in fluid dynamics and is encapsulated in the equation derived from Bernoulli's principle. It asserts that in a streamline flow, the total mechanical energy of the fluid remains constant, which includes the kinetic energy (related to speed) and the potential energy (related to pressure).

When the fluid accelerates and its kinetic energy increases, the energy balance dictates that some of the fluid's potential energy must convert into kinetic energy, causing a drop in pressure. Therefore, any increase in fluid velocity results in a corresponding decrease in fluid pressure, which is why the correct answer clearly states that the pressure drops when the fluid accelerates. This principle is fundamental in explaining various phenomena, such as how airplane wings generate lift and how carburetors function in engines.