Question

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$\bf{My question}$

Why does water at depth in Lake stay cold even on hot summer days?

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Answer 1

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•Water at depth in lake stays cold even on hot summer days because, the sun rays of the sun are reflected through the surface of water and some amount of sun rays can reach at specific distance in water. after this Specific depth, the sun rays cannot reach and hence the temperature is less there.

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•Liquid Water which can flow is densist in 4 degrees C and gets less dense as it gets warmer

Therefore being heavier it naturally goes to the bottom of slow moving lakes and ponds and the warmer water rises to the top.

This is known as stratification and it tends to stay that way as warmer water will not want to go lower and mix.

Large bodies of water have a lot of thermal mass so it can’t change temperature very fast. Also don’t forget the earth itself is cooler down to at least the first 50-100 feet or so heat will not leave through contact with the ground below.

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