No, polyunsaturated fats are generally not solid at room temperature. The presence of multiple double bonds in their chemical structure affects their physical state, rendering them liquid even at moderate temperatures. This liquidity distinguishes polyunsaturated fats from saturated fats, which typically exhibit a solid form when kept at the same temperature like other forms of unsaturated fat.
It's important to note that this physical characteristic of polyunsaturated fats can serve as a helpful guide when choosing cooking oils and other dietary fats. Foods and oils that remain liquid at room temperature tend to be higher in polyunsaturated fats, contributing to a healthier diet.