when they both put in a freezer compartment of the refrigerator.why is it the warm water will turn into ice first compare to the room temperature.water
2007-09-14 02:27:30 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The amount of energy (heat) that is 'pulled' from the water is dependent on the amount of energy in the water. More heat is 'pulled' from the warm water in a shorter time than from the cold. This is why you can be 'burnt' by cold due to the high heat transfer.
A similar experiment can be done with two cups of coffee. If you put milk in one and leave the other black, the milked coffee will cool more rapidly till it reaches equilibrium and will remain at that temperature longer than the black, which will continue to cool in a linear fashion. If you leave for a short while and come back, the milked coffee will be warmer.
2007-09-14 02:39:22 · answer #1 · answered by Anonymous · 1⤊ 1⤋
The warm water will not freeze first - although it cools more rapidly at first, the rate of cooling slows as the temperature difference between the freezer and the water gets smaller. So, although the warm water cools faster at first, when it reaches the original temperature of the room temperature water, it will cool at the same rate, by which time the room temperature water has already had a "head start," causing it to actually freeze first.
2007-09-14 02:46:25 · answer #2 · answered by atstdriver 6 · 0⤊ 0⤋
All other things being equal (position in freezer; thermal conductivity of container, etc.), the cooler water will freeze more quickly. To cool water by one degree C, you must remove 4.186 J/g. So if you started with water at 25°C and at 40°C, you must remove an extra 62.8 J/g of heat from the latter. So 105 J/g must be removed from the cool water and 167 J/g from the warm water to get them both to 0°C. But freezing takes 334 J/g for either so the total heat losses are 439 and 501 J/g -- a difference of about 14%.
2016-05-19 03:05:45 · answer #3 · answered by ? 3 · 0⤊ 0⤋
I think it is something to do with the air dissolved in the water.When the water is heated up some air will lose from the water. The dissolved air act as heat insulator and cause slow heat transfer. I have tried oxygenated water, it takes a few days to freeze which is much slower than tap water.
2007-09-14 05:01:39 · answer #4 · answered by dwarf 3 · 0⤊ 1⤋