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Lecture 04_Phys122 - Topic#1 Fluid sciences Bertrand...

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Bertrand Dano Topic#1: Fluid sciences
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Bertrand Dano Measuring Pressure: the U-tube manometer P 1gage = ρ g Δh P 1 > P atm Δh P 1 P atm P atm W= ρ g Δh S F 1 F atm P atm S+ ρ g Δh S - P 1 S = 0 P 1 = P atm + P 1gage
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Bertrand Dano Measuring Pressure: the open tube manometer P atm P atm P atm P 1 > P atm P 1 Δh P 1 = ρ g Δh
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Bertrand Dano Lake Nyos Cameroon
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Bertrand Dano Lake Nyos CO 2
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Bertrand Dano Lake Nyos •The gas rushed down two nearby valleys, displacing all the air and suffocating up to 1,800 people within 20 km of the lake, mostly rural villagers, as well as 3,500 livestock . •August 21, 1986, a limnic eruption occurred at Lake Nyos which triggered the sudden release of about 1.6 million tonnes of CO 2 . About 4,000 inhabitants fled the area, and many of these developed respiratory problems, burns, and paralysis as a result of the gases. Lake Nyos in normal conditions (left) and just after the 1986 gas release (right). The sudden welling up of carbon dioxide from the bottom of the lake brought iron to the surface, which oxidised, creating the brown rust colour.
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