Lecture 03_Phys122

Lecture 03_Phys122 - Bertrand Dano Bertrand Dano Topic#1...

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Unformatted text preview: Bertrand Dano Bertrand Dano Topic#1: Fluid sciences Bertrand Dano Scuba Diving and Hydrostatic Pressure P atm Surface z P Weight of column of water: Hydrostatic pressure: P h = P atm + ρ g z = ρ A z g Pressure = W/A P = W/A = ρ g z W= m g = ρ V g Bertrand Dano • Danger of emergency ascent? P= ρ g z = 998 kg/m 3 x 9.81 m/s 2 x 30m = 293, 711 N/m 2 = 293, 711 Pa / 1.01 x 10 5 Pa/atm = 2.9 atm P h = P atm + P = 1 + 2.9 = 3.9 atm Using Boyle’s law: P atm V atm = P h V h atm h h atm P P V V = atm atm 1 9 . 3 = = 3.9 If you hold your breath on ascent, your lung volume would increase by a factor of 4, which would result in embolism and/or death. Scuba Diving and Hydrostatic Pressure • Pressure on diver at 30m (~100 ft)? Bertrand Dano Therefore, when SCUBA diving, the air in your lungs at a 10m depth has twice the pressure of air on land. At 20m, it has three times the pressure. At 30m, it has four times the pressure, and so on....
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This note was uploaded on 11/15/2010 for the course PHYSICS 122 taught by Professor Bertranddano during the Winter '08 term at Shoreline.

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Lecture 03_Phys122 - Bertrand Dano Bertrand Dano Topic#1...

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