The standard sea level atmospheric pressure is equivalent toa)10.2 m ...
Pressure at sea level = 101.325 kPa
Checking according to given options.
P = hρg
a) ⇒ 10.2 m of fresh water (ρ = 998 kg/m3)
P = 10.2 × 998 × 9.81 = 99861.87 Pa = 99.861 kPa
b) ⇒ 10.1 m of saline water (ρ = 1025 kg/m3)
P = 10.1 × 1025 × 9.81 = 101.558 kPa
c) ⇒ 12.5 m of kerosene of ρ = 800 kg/m3
P = 12.5 × 800 × 9.81 = 98.1 kPa
d) ⇒ 6.4 m of carbon tetrachloride of ρ = 1590 kg/m3
⇒ 6.4 × 1590 × 9.81 = 99.826 kPa
So option b is nearest, so correct
View all questions of this test
The standard sea level atmospheric pressure is equivalent toa)10.2 m ...
Explanation:
The standard sea level atmospheric pressure is 101325 Pa. This pressure can be expressed in terms of height of a fluid column of a particular density. Let's calculate the height of different fluids that would result in the same pressure as the standard sea level atmospheric pressure.
a) 10.2 m of freshwater of density (ρ) = 998 kg/m3
The pressure at a depth of h meters in a fluid of density ρ is given by P = ρgh, where g is the acceleration due to gravity. Therefore, the height of fresh water required to generate a pressure of 101325 Pa is h = P/(ρg) = 101325/(998*9.81) = 10.2 m.
b) 10.1 m of saline water of density (ρ) = 1025 kg/m3
Saline water is denser than fresh water, so a lower column height is required to generate the same pressure. Using the same formula as above, the height of saline water required is h = P/(ρg) = 101325/(1025*9.81) = 10.1 m.
c) 12.5 m of kerosene of density (ρ) = 800 kg/m3
Kerosene is less dense than water, so a higher column height is required to generate the same pressure. Using the same formula as above, the height of kerosene required is h = P/(ρg) = 101325/(800*9.81) = 12.5 m.
d) 6.4 m of carbon tetrachloride of density (ρ) = 1590 kg/m3
Carbon tetrachloride is much denser than water, so a much lower column height is required to generate the same pressure. Using the same formula as above, the height of carbon tetrachloride required is h = P/(ρg) = 101325/(1590*9.81) = 6.4 m.
Therefore, the correct answer is option B, 10.1 m of saline water of density (ρ) = 1025 kg/m3.