Question

Difference between evaporation and drying

Answer 1

Drying is the removal of water from a substance. For example- keeping sand in the hot sun will dry out the sand. Evaporation is the change of liquid state to gaseous state. For example- on boiling water, the water gets evapourated and turns into vapour.

Answer 2

Difference between evaporation and drying

Explanation:

• Evaporation is a liquid-vapor separation process in which a generally homogeneous liquid phase is thermally saturated by heat and then the vapor is separated by ebullition. The term thermally saturated means that heat is transferred to the liquid phase until its vapor pressure (temperature function) reaches the same value of surrounding pressure. In this state the liquid phase reaches its boiling point (or saturated liquid).Heat must be added in order to supply the evaporation latent heat at ebullition.  As example the clarified sugar (sucrose) solution obtained from squeezing of sugarcane (Saccharum officinarum) is concentrated by evaporation previous its crystallization.  

• Drying is a solid-gas or liquid-gas separation process in which a liquid component is separated from a generally heterogeneous solid or liquid phase as vapor in a gas flow. Heat may be added in order to supply the evaporation latent heat. In this case the separation occurs by vapor pressure gradient instead of ebullition, and the evaporation latent heat can be taken from the gas phase.  As example, fruits (heterogeneous solid phase) can be drying (the water is separated) in a tunnel dryer with air flow at different temperatures below to water boiling point. The separation is due to water vapor pressure gradient between fruit surface and the air, and the evaporation latent heat is supplied by the same air producing a temperature failing between inlet and outlet. Other example, milk (heterogeneous liquid phase) can be converted in powder milk in a spray dryer in which the milk is sprayed in an air flow. As the same of the first drying example the separation is due to water vapor pressure gradient between milk drops surface and the air, and the evaporation latent heat is supplied by the same air producing a temperature failing between inlet and outlet.  

Learn more about evaporation

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What would happen if evaporation did not take place at all​.

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