3)If we want to cool a glass of water, we normally use ice instead of mixing it with cold water. Why?

Answer 1

Ice will cool the water more than an equal amount of cold water because ice will absorb more of the heat in a glass of water for two reasons: 1) ice is colder than cold water simply by virtue of it's temperature, since it is below the freezing point and 2) Ice will take up what's called "latent heat of fusion" as it melts.... what this means is that it will absorb even more heat than liquid water because it takes heat to change the phase of the ice from solid to liquid.

Answer 2

The idea behind adding ice or cold water is to cool a glass of water is to add a something which has lower temperature. The lower the temperature more is the cooling power as the difference between the two is maximum. Cold water will always be above zero and ice will only form below zero. Thus by adding ice you maximize the temperature difference thus maximizing the cooling effect.

Answer 3

In a nut shell we can do both but ice is preferred. Reason is simple:- make use of latent heat of ice. As we know ice will absorb heat equal to the latent heat before it changes to water at 0 deg C. This latent heat is quite large and it cools down the surrounding liquid a lot and then comes in play the specific heat of water which again starts cooling the surrounding liquid there by in itself rising in temp form 0 Deg C to the final temp where both become equal.

Answer 4

because the ice is at the temperature of 0 degree, when it meet hot water,it melt.and absorb more heat. and when you mixture the hot water with cold water,the hot water will be cooled down by heat transfer with the cold water.of course the cold water will not take as much heat as the ice dose.for its temperature is above 0 degree,or it will turn to be ice.

Answer 5

it is due to specific heat of ice .it is 80 calories/gram . ice takes or uses the heat of the surroundings(i.e. of the liquid )to cool down and hence reduces the temp.of the liquid.
the heat consumed is called latent heat which cold water doesn't require as it does no phase change

Answer 6

Just to put some number to it:

100ml water at 20deg plus 10ml water at 0deg will result in 110ml water at 18.2deg. Not much colder than the original.

However, adding 10g ice at 0deg has a dramatically different effect, because of the latent heat of fusion of ice as described by others. 100ml water at 20deg plus 10g ice at 0deg results in 110ml water at 10.9deg.

Answer 7

don't think its linked to maths or science in neways..........kinda simple........coz u dont want to increase d volume of water very singnificantly as compared to the original volume u've.....maybe thats y we use ice in comparison to more of cold water..............wat say.........

Answer 8

if you vote for me i will say it to you immediately