Lesson: Chapter 15 — Fluid Pressure and Its Applications

15.4. Gas and atmospheric pressure 5 of 8 Reset answers

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Question 5

At sea level atmospheric pressure is 76 cm Hg. What is this pressure in pascals? (density of mercury 13 600 kg m⁻³; g = 10 m s⁻²)

A 103 360 Pa B 10 336 Pa C 1 033 600 Pa D 76 000 Pa

The right answer is the one marked above.

103 360 Pa. P = h ρ g = 0.76 m × 13 600 kg m⁻³ × 10 m s⁻² = 103 360 Pa.

1 033 600 Pa comes from converting 76 cm into 7.6 m by mistake. Remember that 76 cm = 0.76 m.

Answer the question to continue.