Why is that hot water freezes quicker than cold water when they are put into refrigerator at the same time?

Answer 1

1st reason: hot water evaporates faster than cold water. Once the containers are in the freezer, the hot water loses more water, so total amount is smaller than the cold water.

2nd reason: The evaporationg liquid will take away energy from the water, aking it cool faster. The hot water lose more energy than the cool water. It reaches freezing point faster.

Answer 2

This is a trick question, and answer is simple.

IF hot water A freezes quicker, that means that it must COOL quicker than cold water B.

But: IF A is cooling quicker, THEN it's going to "catch up" with B and be the same temperature.

Since A and B are now the same temperature, they'll both cool at the same rate.

If A kept cooling faster than B, A would become the "cold" water and B the "hot" water, and so your claim STILL can't be true.

QED

Answer 3

All of the answers above are incorrect.

There is only one simple reason.
If two cups or containers with the same amount of water are put into the freezer at the same time, the one with the hot water will evaporate quicker. This evaporation causes the amount of water in the hot container to go down, so there is less water in the hot container than in the cold container. This causes a larger surface area to volume ratio, causing the hot water (or what is left of it) to cool faster, and thus freeze faster.

The same thing will happen if you put two containers of cold water in the freezer (except for this time with one with only half the amount of liquid as the first). The one with less liquid will freeze faster for the same reason (surface area to volume ratio).

Hope this helps

Answer 4

This will happen under specific conditions!
For example... If the hot water starts at 99.9° C, and the cold water at 0.01° C, then clearly under those circumstances, the initially cooler water will freeze first. However, under some conditions the initially warmer water will freeze first! Hence the Mpemba effect!

The difference between the two is that the water in one is at a higher, uniform temperature than the other... so warmer water will freeze first!

initially warmer water will not freeze before the initially cooler water.....

Answer 5

Extreme temperature changes happen faster. So hot water will freeze faster than cold water.

Answer 6

Hot molecules are closer together so when they freeze they expand faster. Kinda of like a bounce off eachother faster cause they have farther to travel thing. Where as an already cold molecule has to first travel and then bounce around and freeze.

Answer 7

does it really? i hv never heard of it, but i would like to share with you the basic principles of heat transfer.

PRINCIPLE #1 -- if "Q" is the heat energy,"m" be the mass of substance taken for experiment,"s" is specific heat capacity and t1 be the initial temperature and t2 the final temp then
Q=m*s*(t2-t1)
This means that to change the temp of substance u need to give or take heat energy from it. The heat energy is proportional to the mass of substance,sp heat ,and the temp to which you want to change.

PRINCIPLE #2: In order to change the state of a substance you need to give or take energy for it. This energy is denoted by E .
E is proportional to latent heat(L) of substance , mass of the substance .However it does not depend on the temperature as change of state is not accompanied by change in temperature.
Therefore E=mL

NOW coming to ur question we have hot water at say 60degress centigrade or (60+273)Kelvin to freeze it first its temp must reach 0C or 273Kelvin(K) . After this it must loose E amount of energy to convert itself into Ice.
On the other hand cold water say at 10C or 283K only need to go 10degress down and then loose the same E amount of energy as hot water did.

It is clear that hot water looses a lot of heat than cold water.But since you are talking about time.We have to see rate at which a body looses energy.If hot water feezes quicker than cold water it means hot water lost Q1 amount to heat faster than Q2 amount lost by cold water.But this does not make sense,because Q1 will be much bigger than Q2.

If it really happens its really a strange phenomenon.It might happen as other pointed out and called it "mpemba effect".But for all your general everyday heat transfers the two principles rule.

Answer 8

molecules...Kinda like how warm air hits cold air and creates fog!

Hot water the molecules are moving fast and with the sudden change of temp it gives it a case of whiplash the abrupt slow down causes the water to freeze faster.

Basic science...Try listening to the teacher! Ha! Ha!

Answer 9

As we know, hot or cold is due to the transfer of heat. There are more heat in hot water than cold water so it loses heat at a faster rate. Thus, it gains momentum in heat loss.

Answer 10

since the molecules in a hot water is rather more loosely packed than the called water... (water when heated expands,thus molecules began too loosen)...therefore,it is much more easier for the cold temperature to get through...