Drying and Dehydration

Water activity of 1.0 indicates pure water whereas zero indicates the total absence of water molecules

• True

• False

Frying is a method of drying food.

• True

• False

The removal of water is carried out by the application of heat and this heat is usually supplied in the form of solar energy or artificially generated hot air. 

 

• True

• False

The water activity (a_w) value of a food product refers to the moisture content of that food product

• True

• False

Moisture content represents the total water molecules present in the food material

• True

• False

Water activity includes the bound water and free water

• True

• False

Evaporation is the oldest and simplest way of water removal

• True

• False

Artificial drying refers to the use of drying equipment heated by gas, electricity or steam

• True

• False

Drying is removal of water to an almost bone dry condition

• True

• False

During drying process, covering the food with glass or a transparent plastic material can lengthen drying time

• True

• False