Question

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

Answer 1

guage pressure is the amount by which pressure measured in any fluid exceeds that of atmospheric pressure.
for example , excess of pressure, P - Pa at depth h is called a guage 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.

Answer 2

Hey mate,

◆ Answer - Not usually.

◆ Explaination-
- If the atmospheric pressure at two points where Bernoulli's principle is applied is significantly different, then we can't use gauge pressure instead of absolute pressure.
- If the pressure difference is small/negligible, it doesn't matter whether we use gauge pressure or absolute pressure.

Hope that is useful...