Knowing your dews
Question: There have been many times that I have unzipped the flap door on my
tent while still in my sleeping bag to see that a heavy dew had fallen during
the night. Being so close to the dew-laden grass, I always notice that the
individual drops occupy an apparently precarious position at the very tips of
grass blades. How do they get there and how do they stay there?
Answer: This process is called guttation. On the surface of leaves there are
stomata or pores through which water is lost by transpiration. At night, the
stomata…
