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Why are certain fabric fibers more absorbent than others? The answer has to do with the chemical processes of molecular reaction and fluid absorption that lie in the combination of water and different fabrics. For example, synthetic and natural fabrics have a different arrangement of molecules that react differently when combined with the molecular structure of water. Invite your child to test this theory and the power of her scientific observation as she compares rates of liquid absorption with nylon (a synthetic material) and cotton (a natural fiber).