A lipid that contains no carbon-carbon double bonds. Animal fats like butter and lard are composed of saturated fat. Saturated fats tend to be waxy or greasy solids. A salt of a fatty acid . For example, sodium stearate is a soap made by neutralizing stearic acid .
Commercial soaps are mixtures of fatty acid salts.
Compare with permanent hardness and water hardness . The component of total water hardness that can be removed by boiling the water. Compare with saturated fat . A lipid containing one or more carbon-carbon double bonds. Unsaturated fats tend to be oily liquids and are obtained from plants.