Latent heat of fusion and vaporization pdf
File Name: latent heat of fusion and vaporization .zip
- Zinc – Specific Heat, Latent Heat of Fusion, Latent Heat of Vaporization
- Latent heat
- Heat of Vaporization Example Problem
Latent heat , energy absorbed or released by a substance during a change in its physical state phase that occurs without changing its temperature. The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion ; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization. The latent heat is normally expressed as the amount of heat in units of joules or calories per mole or unit mass of the substance undergoing a change of state.
Zinc – Specific Heat, Latent Heat of Fusion, Latent Heat of Vaporization
Solids can be heated to the point where the molecules holding their bonds together break apart and form a liquid. The most common example is solid ice turning into liquid water. This process is better known as melting, or heat of fusion , and results in the molecules within the substance becoming less organized. This process is commonly known as the freezing , and results in the molecules within the substance becoming more ordered. Determining the heat of fusion is fairly straightforward. When a solid undergoes melting or freezing, the temperature stays at a constant rate until the entire phase change is complete. By drawing this chart before conducting a heat of fusion analysis, one can easily map out the required steps in completing the analysis.
Thanks for visiting our website. Our aim is to help students learn subjects like physics, maths and science for students in school , college and those preparing for competitive exams. All right reserved. All material given in this website is a property of physicscatalyst. Latent Heat Latent heat: The heat energy which has to be supplied to change the state of a substance is called its latent heat. Latent heat does not raise or increase the temperature. But latent heat has always to be supplied to change the state of a substance.
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where L is the latent heat of fusion or vaporization, depending on the phase transition that occurs. In this experiment, an ice cube of mass mt, assumed to be at.
Heat of Vaporization Example Problem
Latent heat also known as latent energy or heat of transformation is energy released or absorbed, by a body or a thermodynamic system , during a constant-temperature process — usually a first-order phase transition. Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes , i. The term was introduced around by British chemist Joseph Black. It is derived from the Latin latere to lie hidden.
The learning objectives in this section will help your students master the following standards:. Introduce this section by asking students to give examples of solids, liquids, and gases. So far, we have learned that adding thermal energy by heat increases the temperature of a substance. But surprisingly, there are situations where adding energy does not change the temperature of a substance at all!
The enthalpy of vaporization is a function of the pressure at which that transformation takes place. The enthalpy of vaporization is often quoted for the normal boiling temperature of the substance. Above the critical temperature , the liquid and vapor phases are indistinguishable, and the substance is called a supercritical fluid.