BIOLOGY 2F03 Chapter Notes - Chapter 6: Vapor Pressure, Water Potential, Namib Desert
11 Oct 2016
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Increased temp. can lead to high rates of water loss -> lethal! Cicada in desert still remain active when environmental temp. exceed its lethal max. Concentration gradients in uence the movement of water b/w an organisms and its environment! Water tend to move down [ ] gradient! > determine whether an organism tends to lose or gain water from enviro. As amount of water vapour in surrounding air increases, [water] gradient from organisms to the air is reduced and rate @ organisms lose water to the atmosphere decreases! Since air is rarely contains all water vapour it can hold, we use degree of saturation as relative measure! Relative humidity = (water vapour density) / (saturation water vapour density) x100! Actual amount of water in air is measured directly as mass of water vapour per unit volume of air. Water vapour density -> in mg h2o/l or g h2o/m^3!
