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First, a pond is comparatively deep - a couple of meters at least in its middle. Earth's temperature at this depth (I mean not in the pond exactly, but elsewhere) is comparatively stable - at least in the regions of mid-to-north Eurasia - I believe some 5-12 grades Celsius throuhout a year. (This temperature stability is used in air conditioning applying freon compressing - in winter when air is much colder this temperature difference is used for home heating, in summer, when air temperature is much higher this difference is used for cooling). So, it may be said that at the bottom of the pond there may be 16 degrees while the air ifor a long time is 26.

By that the surface of the pond's water reflects more light of the sun than the surface of the earth does.

Other factor is that water keeps evaporating (despite the fact that it is colder than the air) because it is liquid. The pond evaporates some of the molecules of its water so long as the air is relatively dry - by that the water get slightly cooler than the air measured by a conventional thermomter.

Somebody has added that:

Water is also a very poor conductor of heat. (You can hold the bottom of a test tube of water with your fingers while the top of it is boiling over a Bunsen burner.) So the hot summer might warm the top layer of water, but the heat is not quickly transferred down to the bottom.

But the fact that tube keeps being tolerable to the hand holding it at the bottom is owing to the water keeping eavaporating, so cooling itself. If the tube were hermetically closed, the water in it unable to evaporate and cool itself down would at first created a very big preassure (suppose the tube is securely firm) then it would have conducted the untolerable heat to the bottom no slower than a metal bar would do. Water is not a poor conductor of heat - only at the sea-level atmospheric preassure it won't allow its heating up over 100 degrees C.

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13y ago

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