Physics

Páginas: 3 (735 palabras) Publicado: 13 de marzo de 2013
Specific heat capacity of a material
It is define as the measure or amount of heat that it is proportional to one gram of substance so the temperature increases to °C.
The specific heat capacity ofa material or substance it is used to describe how much energy it is needed to increase the temperature from 1kg of a substance/material to 1K.
The specific heat capacity depends on the temperature.Difference between latent heat of fusion and vaporization
When a substance is melting or evaporating it is absorbing certain measure of heat, latent heat of fusion or latent heat of vaporizing,depending on the case. The latent heat manifests when the temperature starts to increase, during a foundation or vaporization of a substance.
Q = m·Ce·(Tf-Ti)
The amount of heat that is beingtransfered or recived from a body it is calcúlate with this formula, in which the “m” is the mass and the “Ce” is te specific heat, To is the initial temperatura and T is the final temperature Tf – Ti = ΔT.If we want to pass a solid into a liquid it has to absorb the energy that is needed to destroy de union between their molecules. If we want to melt a ice or freeze water without cange in tetemperature it is needed an exchange of 80 calories per gram or 80 kcal per kilogram.
In a certain pressure every liquid or substance vaporizes at a certain temperature “boiling point”. This one maintainsa constants that it is independent to the heat that is applied to the liquid, if we elevate the temperature it would start boiling faster without change on the temperature.
When the boiling isproduce the temperature wont increase and that makes that the substance starts evaporating.
* Exercise
Calculate the amount of heat required for 100 grams of ice change to -0 ° C in steam at 130 ° C.development

To the ice raise its temperature from -10 ° C to the melting point at 0 ° C requires an amount of heat equal to:

Q1 = m CeΔT = 100 gx 0.50 cal / g ° C x 10 ° C = 500 cal....
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