Which is warmer -tepid or water?
415445
Tepid is a rough measurement of warmth.  Tepid water is barely warm.
591487
I am comfortable swimming in water that is warm.  It has to be at least 90 degrees out and the water has to be very cool not to warm not to cold.  Just enough to cool me off
741460
Two things are unusual about water.\n\n1. Frozen water (ice) is less dense than liquid water, as a few answerers have already said.  For every other liquid, the frozen form is more dense.\n\n2. As it cools, water gets steadily denser until about 4 degrees C, then it gets slightly less dense as it cools to its freezing point at zero degrees C.  Every other liquid just gets steadily denser and denser until it freezes.\n\nBoth of these unusual things are quite important for life on earth, but the second one is much more important than the first one.
935828
Water deep under ground is essentially at a constant temperature year round.  If it is at, say, 9 C, it will be colder that warm summer day of 30 C, and warmer than a cold winter night of -10 C.\nSo, it is not that water than change temperature, it is the perception based on the fact the weather changes.
602506
1. Water boils- 212 degree F/100 degree C\n2. Normal Body temp- 98.6 degree F/37 degree C\n3. Water Freezing temp- 32 degree F/ 0 degree C
685755
Ice water.  Ice is the solid phase and the water is the liquid phase.
978480
Yes, in some specific circumstances, hotter water freezes faster than colder water.  All explanations are still hypotheses and there is no fully proven explanation yet for why.  It's known as the Mpemba effect.
673796
Boiling water has a temperature of 100 Celsius, steam can have higher temperature.
360729
It doesn't.  The t(exp 4)(temperature difference to the 4th power) law works here.  The higher temperature water will cool faster than the cooler water, however, when it reaches the temperature that the cooler water was in in the first place, it will cool at the same rate the cooler water cooled with.
354816
generally people prefer about 70 degrees F. It can be lower but people in general will find it too cool. Some might find even 70 overly cool. Remember body temperature is 98 and water is a good conductor of heat. If it is sunny and warm outside, the water can be cooler and feel comfortable than if it is not. On a cloudy cool day, 80 water termperature will feel much better than 70.
709458
When water is heated, the molecules begin to move faster and the bonds begin to break.  This results in evaporation of water into water vapor.  When water vapor cools back down and the molecules move slowly enough for the bonds to reform, the vapor condenses and reforms liquid water.
289726
well, it all depends. If you live in like, california it can be anything from really weird weather like hot one week and a blizzard the next, and if you live in like south america, in peru, the waters get really warm. that's just a few of them.
739078
Because it takes a lot more energy to change the temperature of water than it does to change the air temp, since water is considerably denser.  The large body of water thus acts as a "heat-sink" holding on to heat during the day and releasing it into the air at night to keep the temperatures more moderate.\n\nBy the way, "moderate" doesn't just mean warmer in the winter, it can also mean cooler in the summer -- just less extreme all year 'round.  The same way the water holds on to heat during the winter, it stays cooler in the summer and moderates summer temps by being a constant cool source and through evaporation.
745215
The answer is yes. And I bet you want more of an explanation, which gets a little tricky. It would seem evident that cold water would freeze faster than warm water. But there have been raging debates in scientific circles over whether that's true or false. The fact is a lot of different factors contribute to how fast water freezes, including its beginning temperature.\n    Physicists writing in the journal Scientific American have waded into the fray and have probably come the closest to a satisfactory answer. Quoting Paul G. Hewitt in the book Conceptual Physics, the Scientific American writers believe that hot water will freeze faster than lukewarm water, but not faster than cold water. (Except under certain circumstances.)\n    According to Scientific American, water at 90° C will freeze before water that is 60° C. Below 60° C, however, there is a switch and the cooler water will freeze faster. For example, 30° C water will freeze faster than 60° C water. It has to do with the water evaporation of the hot water immersed in a cold environment. The rate of cooling by evaporation is way higher for hot water than for the cooling of lukewarm water.\n    Now, for those certain circumstances. When you put a pan of cold water and a pan of hot water in a freezer (both pans have equal masses of water), the hot water experiences this rapid evaporation AND freezing from below, which cools water on the bottom of the pan. Because the surface water is already warm or hot, the water at the bottom just sits there instead of rising, getting colder and colder. The water at the top experiences evaporation. The combined effect could make the hot water freeze faster than the cold water.
879340
If it has to be a WATER bath then you are limited by the freezing and boiling points of water, and the lowest you can get will also depend on whether the equipment is capable of cooling as well as heating - if not, then agree with previous answer, ambient room temperature is as low as you will get. If you have an OIL bath capable of both cooling and heating then your useable temperature range will be hugely expanded.
623955
Warm water holds less oxygen than cool water, so it may be saturated with oxygen but still not contain enough for survival of aquatic life.
514471
There is a difference between boiling and evaporating.\nAt 100 degrees water starts boiling. The temperature can not rise because al the energy you put in is used by the molecules to 'escape' and the water to change into gas. That is why damping water cools off. But water kan evaporate also at lower temperatures because molecules can 'escape'. The molecules are not as volatile as at 100 degrees, but they are volatile. Winds helps because the dryer the air, the easier it is to escape. Is the air humid, than the molecules can be caught in the water again. \nSorry I am not a chemist but I think this is it essentially.