Why does the Fruit in Jelly floats to the top while canning?

During canning, the fruit floats to the top of the jar because of buoyancy and the heat involved in the process. As the fruit heats up, air trapped inside it expands and escapes, making it less dense than the surrounding syrup or liquid. Additionally, as the jar is sealed and cooled, the syrup may become denser, allowing the lighter fruit to rise. This phenomenon is common in canning and is typically not a concern for the preservation process.