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Why would the water in a swimming pool or lake feel warm when the air outside is cool?

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Water molecules and heat It takes longer to heat or cool water than for air. The water was probably warm from being heated by the sun all day, and so was the air. But in the evening or when there is a cloud cover, the air cools more rapidly than the water, hence the observed difference and conflict. Likewise, water that sits in the cold all night long (or for several days) stays cold for a long time, even during the first few hot days where the air is warm.
ADDITIONAL NOTE ABOUT POOLS When you jump out of a swimming pool, the water molecules on the surface of your body escape with whatever body heat you had while in the pool. Water is an excellent conductor of heat (as opposed to an insulator) so it steals heat from your body. So you feel colder out of the pool right after you come out.
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How warm should a pool be to go swimming?

It should be about room temperature- maybe a little colder in the summer; 70 to 75 degrees is good- that way, the water isn't freezing, but isn't hot.

What is the ideal swimming pool temperature if you have 30-34 Celsius outside air temperature?

30C-34C is about 86F-93F! That temp will generally feel too warm for most people in a pool. A better temp that would suit more people would be around 27C-29C or 80F-84F. T

Why do you feel lighter in a swimming pool?

we feel lighter when we are in a swimming pool. this is because of buoyant force or upthrust. it is the upward force acting on a body immersed in a fluid.

What would cause you to be sick after swimming in a salt water pool?

Answer   If you accidently swallowed some of the salt water.   Unless the sanitary conditions were extremely poor you may not have gotten sick from the pool water. How

Swimming pool water odor?

  Your question is not clear. Assuming that you are smelling a strong chlorine smell near or around your pool would indicate that you do not have enough chlorine residual

What is a fresh water swimming pool?

A fresh water swimming pool is a swimming pool that does not use a saltwater chlorinator. A pool that used a salt water chlorinator has salt added to it to so that a salt wate

How do you measure the water in swimming pool?

To figure the volume, you must multiply width x length x height = volume measured in cubic feet.. Then you must convert the cubic feet to gallons per square foot. The numb