Question

state the appropriate reason for a wet cloth dries quickly in breeze or by shaking the cloth ​

Answer 1

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Some of the water molecules on the surface of the wet cloth have enough energy to escape into the air (to evaporate). Some of them may gain enough energy to escape by first absorbing heat from sunlight, or by being hit by a fast-moving air molecule. This is why clothes will dry faster in the sun and/or in the breeze

Answer 2

Answer:

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Drying cloth involves two processes. Energy has to be provided to change the water from liquid to vapour and an air stream is needed to remove the vapour. We discuss the two processes separately and then describe an experiment which demonstrates their relative importance.

Evaporation needs energy

Although everyone knows that waving a wet cloth in the air cools it down, the explanation for the phenomenon is not obvious, so we digress for a few paragraphs to explain why.

According to the kinetic theory, temperature is the expression of the average energy of molecular motion. The red curve in Figure 1 shows schematically the energy distribution of water molecules at 20°C (there is a more detailed explanation, and an accurate version of this diagram in the chapter The Preservation Index...). Only molecules with a high kinetic energy, towards the right hand end of the graph, will escape from the liquid water surface, against the cohesive force that binds the molecules in liquid water. As soon as this happens, the remaining molecules re-distribute their energy by collision, moving towards the blue curve, representing a lower temperature, because the average molecular energy is lower (indicated by the vertical dashed blue line).

Notice that the proportion of high energy molecules is much diminished, even though the temperature has only fallen five degrees. This means that the rate of evaporation will be much lower, giving time for heat to migrate into the wet cloth from the surrounding air or other materials touching the cloth. Eventually the temperature will stabilise at some value below ambient which depends on the balance between the rate at which the water molecules emerge from the surface and the rate at which heat can reach the cloth to re-invigorate the remaining molecules in the liquid.