A solid is melted and allowed to cool and solidify again. The temperature is measured at equal interval of time. The graph below shows the change of temperature with time. The part of the curve that is practically horizontal is due to
Latent heat given away by the liquid
Concept:
- Latent heat is an amount of heat absorbed by a unit mass of the substance to change its state without change of temperature.
- The S.I. unit of Latent heat is joules per kilogram.
- Latent heat is used up in overcoming the force of attraction between the molecules of the substance.
Explanation:
- In our given graph as time changes, we can see a flat curve which shows that for certain time temperature will remain constant this because of property known as latent heat of material
- This can be easily observed during the melting of ice, although the ice will be melting unit complete ice is melted temperature of the mixture(ice and water) will be at 0°
- the same phenomenon is applicable in this case horizontal line is due to Latent heat given away by the liquid remains constant
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