How do you change state of matter in whipped cream and jello?

To change the state of matter in whipped cream, you can melt it by applying heat, causing the liquid cream to lose its structure and separate. In the case of Jell-O, you can change it from a solid to a liquid by heating it, which breaks down the Gelatin structure, allowing it to dissolve. Once cooled, both can revert to their original states: whipped cream can be re-whipped to regain its airy texture, and Jell-O will set again as it cools.