Question

What is bound and unbound water in drying?

Answer 1

Here is the difference between bound and unbound water

Explanation:

• Unbound is that water that is present on the surface  
• This water evaporates easily with a normal moisture balance
• There is no pressure of such water
• While bound water is that which is present in the capillaries .
• This water cannot evaporate freely and there is pressure on such type of water.

Learn more about evaporation here:

What is Evaporation?

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Answer 2

Explanation:

Drying is a process of removing the moisture from the products to preserve the same for a long time. The moisture or the water that is present on the surface is unbound water and the moisture or the water that is present inside the capillaries is bound water.  

Unbound water or moisture can be removed easily by the process of evaporation.

Bound water cannot be removed with just evaporation they need even more pressure inducing methods to remove the water or the moisture from inside the capillaries.