Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli’s equation? Explain.

Question

Philoid · Accepted Answer

The excess of pressure, P − Pa, at depth h is called a gauge pressure at that point.

The bernoulli’s equation works when the atmospheric pressure at the two points at which it is applied is significantly different. Using gauge pressure instead of absolute pressure in bernoulli’s equation not matter as we are using the difference only.