Is 0 degrees 0 the freezing point or melting?? How it can be both??

Answer 1

Bring the temperature of ice up to exactly 0 degrees Celsius. It will remain ice. You must add 80 calories of heat per gram of H2O in order for it to melt. The addition of this heat does nothing to the temperature of the ice, but it does melt. This is called the phase change. The 80 calories are used to shange the phase of the water from solid to liquid and does not affect the temperature.

It's just backward going form liquid to solid water. Bring the temperature of water down to exactly 0 degrees Celsius. The water will need to give up 80 more calories of heat per gram of water in order to solidify and become ice. The temperature does not change.

The 80 calories needed for phase change is specific for water. Other materials behave differently.

The phase change between steam and liquid requires 540 calories per gram of water. Again, this is not associated with a temperature change as the energy is used for the change in phase.

Answer 2

0 degrees Centigrade is the freezing and melting point of water

it is not the freezing or melting point of most things

a materials freezing point HAS to be equal to its melting point

it works like this:

if you have ice, and you start adding heat to it, it will get warmer until the ice gets to 0 Centigrade

at that point it is solid ice, at 0 degrees centigrade

you then have to add heat to make it into liquid water still at 0 degrees centigrade

this is called the "phase change"

during the phase change, the material does not change temperature even though you are adding (or removing) heat, the energy added goes into turning the material from solid to liquid

after you get liquid water at 0 degrees, then any heat added raised the temperature of the water

it works the same going the other way

if you have liquid water and start cooling it, it will cool until it is liquid water at 0 degrees C, additional cooling will make it solid water still at 0 degrees C, and then you can make the ice colder by cooling

so, the melting and freezing point is the same for any compound, including water

got it?

Answer 3

0 degrees Celsius is the freezing point, I've never heard of a melting point.

Answer 4

32 degrees Fahrenheit is the freezing point of fresh water on this planet but 33 degrees frozen water will begin to melt very slowly.

Answer 5

Hey folks, if you don't know... don't answer. Seriously, it's sad.


It is both. How? That's easier than you think.
First, I assume you mean water.

If ice is becoming liquid water, it is melting.
If liquid water is becoming ice, it is freezing.

In other words,
Solid to liquid at 0 C... melting point
Liquid to solid at 0 C... freezing point

Answer 6

It's not both.

At zero, water will freeze. At one, it will melt.

Granted, one might wait a while to achieve a given amount of the liquid becoming solid and vice versa.

But, tis the way it is!

Disclaimer:

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Answer 7

Depends on whether the temperature is rising or falling at the time it registers 0