define latent heat of fusion and latent heat of vaporization.And explain how they are different. Also mention the value of latent heat of fusion and latent heat of vaporization.
Answers
Answer:
Latent heat of fusion is the amount of heat required to change phase from solid to liquid at constant temperature.
Whereas, latent heat of vaporization is the amount of heat required to change phase from liquid to vapour at constant temperature.
The key difference between latent heat of fusion and vaporization is that latent heat of fusion is the amount of heat that a solid substance requires to change its phase from solid phase to liquid phase at a constant temperature whereas latent heat of vaporization is the amount of heat that a liquid substance requires to change its phase from liquid phase to vapor phase at a constant temperature.
Latent heat of fusion and vaporization refers to the change in heat energy at constant temperatures. The latent heat of fusion describes the change in heat at a substance’s melting point. On the contrary, latent heat of vaporization describes the change in heat at the boiling point of a substance.
The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram.
Answer:
something we can measure, like heating up some water on the stove. The room temperature water requires heat from the stove to raise its temperature. We can measure the temperature changes and feel the water getting warmer, ie we can sense the change.
Once that water reaches 212 degrees it doesn't just automatically start boiling. It requires more heat energy to vaporize but it doesn't increase in temperature any more than it's boiling point. This is what we call latent heat of vaporization. We are adding more heat to the water but the temperature doesn't increase, the heat causes a phase change to occur and the water vaporizes. This is not a measurable change like with temperature so we call it latent heat.
Side note: It takes 1 btu of heat to increase the temperature of one pound of water by one degree Fahrenheit. It takes 970 btus to vaporize one pound of 212 degree water! That's a huge difference!
Latent heat of fusion is similar but with solids and liquids.
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Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process. In contrast to latent heat, sensible heat involves an energy transfer that results in a temperature change of the system.
The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure.
The amount heat required to convert unit mass of liquid into its vapour state without change in its temperature called is latent heat of vaporization.
Latent heat is the amout of heat required to change the state of a substance where temperature change does not occur but only phase changes.
Suppose if we have 1 kg ice at –10 degree C and we have to convert it into water then first this ice will be taken to 0 degree centigrade which is its melting point and then keeping the temperature constant ice will be converted into water and the heat required here is termed as latent heat of fusion similarly, after that water at 0 degree C is taken upto 100 degree C which is its boiling point and when this water at 100 degree centigrade is converted to steam at 100 degree C , heat consumed will be termed as heat of vaporization.
Latent heat of fusion for ice = 80 cal/mol
Latent heat of vapourisation for water= 540 cal/mol
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