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Q9.12: NCERT Physics - Part 2 MECHANICAL PROPERTIES OF FLUIDS 9.12 Solution: Does it matter if one uses gauge instead of absolute pressures…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often think Bernoulli requires absolute pressure and therefore add atmospheric pressure to the pressure term only, which corrupts the balance of the equation. Remember that Bernoulli relates pressure *differences*; using gauge pressures is safe as long as the same reference (e.g., atmospheric) is applied to every pressure term, because any constant offset cancels out.
Does it matter if one uses gauge instead of absolute pressures in applying Bernoulli's equation? Explain.
Step-by-Step Verified Solution
**Answer:** No, it does not matter.
**Step-by-Step Explanation:**
Bernoulli's equation involves pressure differences. Adding a constant atmospheric pressure to all terms (converting gauge to absolute) does not change the equation, since the constant cancels out.
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