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Engineering · Civil Engineering
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(2) Consider a barometer shown in figure below. The gravity is g. The ambient pressure is Pa and the pressure above the liquid column in the 2096) density of the liquid is o and the acceleration due to tube is zero. (total 2R (a) What is the relation between the ambient pressure Pa and p height of the liquid column h, when surface tension effects are neglected? (590) (b) Now consider a case when the radius R of the barometer tube is small and surface tension effects become important. The three phase contact angle is 0 and the surface tension of the liquid is σ. Consider a case when θ > 900 (hydrophobic疏水性). What is the expression for Pa under this regime? (1096) (c) Under what conditions can we neglect surface tension effects? Please express your answer in terms of the given quantities. (5%)
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