Which would freeze over first? the boiling water? or room temperature water?

Question

if both put into a freezer at the same time, which would freeze over first?

the boiling water straight from a kettle?

room temperature water straight from a tap?

9 minutes ago - 3 days left to answer.

Answer 1

If you count the time for cooling from 100 deg c to zero you will find it bigger than cooling from 9 deg c to zero.

But if you do not observe the cooling time and just measure the freezing time i have heard the the boiled water is freezing quicker because there is less oxygen and nitrogen and co2 in it.

In houses the hot water pipes freeze first in the winter in equal situations with cold water pipes.

Answer 2

Assuming the same amount of each, in identical containers.  The boiling water loses heat faster because it's hotter.  But, the question isn't which loses heat faster, it's which will freeze first.  After a certain time, the boiling water will cool.  At some point in its journey to freezing, it will reach the temperature of the room temperature water at the start.  But at that time, the room temperature water will be colder, while the initially boiling water follows exactly the same time-temperature curve as the room temperature water did initially.   So, the room temperature water freezes first.   There will be some effect on super-cooling because the boiling water has less dissolved gas, but that's a small effect.  It is the effect that you notice with water pipes in houses, but those both start at room temperature, since the hot water pipes cool to the same temperature as cold water pipes quickly when you turn off the water flow.

Some may say that the steam from the boiling water will condense inside the freezer and freeze first ..   Bah.     (some of the room temperature water is also evaporating, so there!)

Answer 3

I guess its a trick question but I still say room temperature water.

Answer 4

no one knows all scientists hav diff opinions on it

Answer 5

Boiling water at 373 K needs to be cooled to 273 K (freezing point) by removing 4.18 J/g-K.  One gram of water at 373 K would require 418 (100 X 4.18) joules to cool to freezing.  One gram of water at room temperature (about 298 K) would require 105 joules (25 X 4.18) to cool to freezing.  Once both 1-g samples are at freezing, they both require the removal of 334 joules to freeze.  Assuming there is no evaporation, keeping the masses of the water in both samples constant, with heat removed at the same rate, the cooler water will freeze first.  On the other hand, if you place boiling water into an empty freezer, you will soon see ice crystals on the side of the freezer as the vapor given off by the hot water deposits as solid ice on the cold freezer walls.

Answer 6

Room temperature water, in the same fashion that room temp water boils faster than cold.

Answer 7

the boiling water

Answer 8

Newtons Law of Cooling states that the rate of cooling is proportional to the difference in temperature between the water and it's surroundings. therefore the boiling water will cool more quickly initially as the temperature difference is much greater. however, it will at some point reach the temperature at which the tap water started, and follow the same rate of cooling, by which point the tap water will be some degrees ahead. the tap water will freeze first.

Answer 9

boiling water its got some thing to do with the molecules moving aroun quickly

Answer 10

Its the boiling water, due to evaporation and the fact that through boiling most of the air is removed, and various other factors which can change the result of the experiment. Its known as the Mpemba effect, heres a link if you want to read the exact science behind it, hope that helps,  enjoy :)

http://math.ucr.edu/home/baez/physics/Ge...  

Answer 11

Definetly room temperature water will freez first as it contain less less heat as compare to the boiling one.

Answer 12

The boiling water because heat loss occurs more rapidly

Answer 13

room temp, its already a lot lower temp than boiling, so its closer to freezing...kinda like a head start in a race

Answer 14

room temp water...it takes less time to cool down