Mercury manometers are often used to measure arterial blood pressure.

1.	Mercury manometers are often used to measure arterial blood pressure. The typical blood pressure of a young adult raises the mercury to a height of 120 mm at systolic and 80 mm at diastolic. Express these values in pascal and bar. [Density of mercury = 13600 kg/m3 , 1 mbar = 100 Pa]
Answer» Data : p_max = p_syst = 120 mm of Hg, p_min = p_dias = 80 mm of Hg, ρ = 13600 kg/m³ , g = 9.8 m/s² , 1 mbar = 100 Pa p = hρg ∴ p_syst = (0.120)(1.36 × 10⁴)(9.8) = 1.6 × 10⁴ Pa = 16 kPa = 1600 mbar = 1.5 bar and P_dias = (0.08)(1.36 × 10⁴)(9.8) = 1.066 × 10⁴Pa = 10.66 kPa = 1066 mbar = 1.066 bar

Mercury manometers are often used to measure arterial blood pressure. The typical blood pressure of a young adult raises the mercury to a height of 120 mm at systolic and 80 mm at diastolic. Express these values in pascal and bar. [Density of mercury = 13600 kg/m3 , 1 mbar = 100 Pa]

Answer»

Data : p_max = p_syst = 120 mm of Hg, p_min = p_dias = 80 mm of Hg, ρ = 13600 kg/m³ , g = 9.8 m/s² , 1 mbar = 100 Pa

p = hρg

∴ p_syst = (0.120)(1.36 × 10⁴)(9.8)

= 1.6 × 10⁴ Pa = 16 kPa

= 1600 mbar = 1.5 bar

and P_dias = (0.08)(1.36 × 10⁴)(9.8)

= 1.066 × 10⁴Pa = 10.66 kPa

= 1066 mbar = 1.066 bar