BIOLOGY 2F03 Lecture Notes - Lecture 6: Pore Space In Soil, Cool Air, Soil
11 Dec 2015
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Document Summary
Concentration gradients influence the movement of water between an organism and its environment. Water availability varies (ie. if place receives a lot of snow, they need to wait for it to melt to get water) A measure of the water content of air = relative humidity. Relative humidity = (water vapour density / saturation water vapour density) x100 (saturation of water vapour = the quantity of water vapour that the air can potentially hold. Saturation water vapour density changes with temperature : warm air can hold more water vapour than cold air. Ex. if humidity of air is less then 100%, some of the water in your breath will be absorbed by the surrounding air but if the temperature is low, such as 0 c, It will hold substantially less water meaning that some of the water vapour cannot enter the air and instead condenses into a cloud, and you see your breath page 149.
