Water
A steep density gradient in a body of water can have the effect of trapping energy and preventing convection, such a gradient is employed in solar ponds. In the case of salt water, sharp gradients can lead to stratification of different concentrations of salinity. This is called a Halocline.
Read more about this topic: Density Gradient
Famous quotes containing the word water:
“As must have rung the harvest-song of Linos
Of bloody water in a heap of stones.”
—Allen Tate (1899–1979)
“Why are a lady’s thighs always cool? That is, said the monk, due to three causes for which a place is always naturally cool: primo, because water runs all the way down it; secondo, because it is in a shady, dark and obscure place, where the sun never shines; and thirdly, because it is continually fanned by the winds from the breezy hole.”
—François Rabelais (1494–1553)
“Because of neglect, Son,
though well-forged
in affectionate bonds,
Love in time
will trickle away
like water through cupped hands.”
—Hla Stavhana (c. 50 A.D.)