Final answer:
Polyunsaturated fatty acids are fatty acids that contain two or more carbon-carbon double bonds, making them liquid at room temperature and preventing them from packing tightly due to the kinks at each double bond.
Step-by-step explanation:
The specific term for fatty acids containing two or more carbon-carbon double bonds is polyunsaturated fatty acids. These acids are a type of unsaturated fat found in various foods, particularly plant oils, and are liquid at room temperature due to the presence of multiple double bonds in their hydrocarbon chains.
Examples of common polyunsaturated fatty acids include omega-3 and omega-6 fatty acids, which are essential for human health. Unlike saturated fatty acids, which have no double bonds and are fully saturated with hydrogen atoms, polyunsaturated fatty acids contain kinks at the site of each double bond, preventing them from packing tightly together.