Why ice is more effective in cooling than cold water at the same temperature?

Question

What is latent heat of ice and water?

Answer 1

its not possible to have water the same degrees as ice. water freezes at 32 degrees F. if water is the same temp as the ice, the the water should be frozen casue its cooler than 32 degrees.

Answer 2

At one atmospheric pressure: Ice is at temperature zero degree C and below. Ice is not neccessary at zero C.

Regarding latent heat of fusion, easily find in the web, it is the energy require to break down the crystal structure so that solid becomes liquid. That is also the energy to remove when you want to transform liquid into solid state.

For cold pure water, the lowest termperature is zero deg C.

So if you compare the "effective" cooling, the lowest temperature matter will help absorb heat faster.

Now I want to add a point to a statement before, the water mix with ice provide a wider area for soda cans. This allowing the convection and conduction of heat to occurs.

If you put soda into ice, the total area of soda can touching the ice cubes is less than the water which completely cover the soda can. In this case, the convection did not occur to help the heat transfer.

Answer 3

The example about the can of soda was right on, because the water presents much more surface area to the can and therefore absorbs the heat much better.

But I think the answer you're looking for is this:

Water can exist at 32 degrees and not freeze. Additional energy (heat) must be removed to make the water freeze. And, here's the important part, it takes a LOT of energy (in or out) to change from water to ice, or ice to water!

To heat 1 ml of water 1 degree celcius, it takes 1 calorie of energy (that's the definition of a calorie. And that's not the same as a calorie in nutritional terms.) To cool 1 ml of water 1 deg. celcius, you need to take one calorie of heat out.

But, to convert 1 ml of water at 0 deg C. to ice (still at O deg. C), or the equivalent amount of ice back to water, it takes 80 calories! This is why an ice cube can last for several minutes in a glass of water.

(that 80 may not be exactly right, but it IS a number MUCH larger than 1)

Answer 4

The water in ice is in a different chemical state than water in liquid form - it is in a crystalline lattice. It takes energy to break that form and convert the ice to water. The energy used to break that form comes from the heat taken away from whatever the ice is cooling. Therefore, ice is better at cooling than is water of the same temperature.

Answer 5

whenever any substance is heated from a solid to a liquid, it undergoes phase transition at its melting point. basically, what happens is the heat, instead of raising the temperature of the substance, breaks apart the rigid bonds that characterize a solid, turning it into a liquid. once the solid has melted away, heat absorbtion again manifests itself as a rise in temperature

in short, ice at 32F has yet to be melted into water at 32F

to raise the temperature of 1 kg of water by 1°C, it takes 2.100 kJ when solid, or 4.186 kJ when liquid. however, to melt that mass with no change in temperature requires 334 kJ! by the time you get your ice block completely melted, the same heat source could have your water bucket up at 80°C (175 F). you'd be better off brewing tea rather than quaffing a brewski ;)

as for timing how long it takes a can to cool down in a bucket of water vs. a bucket of ice, make sure you control all your variables first by drilling a hole in the ice to conform with the can!

Answer 6

I would think the cold water would cool better than ice at the same temp. The water covers a larger surface area than the ice would.

Answer 7

Actually, water is better at cooling than ice. Leave a couple of cans of soda out in the sun until they're warm. Place one in a bucket of ice, and another in a bucket of water with ice. then use an IR thermometer to see how quickly they cool down. The one with water cools down MUCH faster than the one with ice alone.

Answer 8

Actually drummerbock, you can indeed have water at the same temperature as ice. The triple point of H2O allows it to exist as ice, water, AND vapor, all at the same time.

See where the three solid lines converge in the source listed below.

A common example is a partially frozen lake, and the air has non-zero percent humidity.

Answer 9

At one atmospheric stress: Ice is at temperature 0 degree C and under. Ice isn't neccessary at 0 C. related to latent warmth of fusion, surely discover interior the information superhighway, it relatively is the ability require to break down the crystal shape so as that good turns into liquid. it is likewise the ability to get rid of once you opt for for to remodel liquid into good state. for chilly organic water, the backside termperature is 0 deg C. So in case you evaluate the "helpful" cooling, the backside temperature rely will help take in warmth speedier. Now i decide for to characteristic a element to a fact till now, the water combination with ice furnish a much broader section for soda cans. This allowing the convection and conduction of warmth to occurs. in case you placed soda into ice, the completed component of soda can touching the ice cubes is decrease than the water which thoroughly conceal the soda can. subsequently, the convection did no longer take place to help the warmth flow.

Answer 10

ice is more effective becoz it takes away extra heat as latent heat of fusion.latent heat of fusion of water to ice is about 80 cal/g or 5987J/mol