Physical changes refer to alterations in the form or appearance of a substance without changing its chemical composition. For example, when ice melts into water, it undergoes a physical change. The molecular structure of the ice remains the same, but its state changes from solid to liquid. Other examples include breaking a glass, cutting fruit, or dissolving sugar in water. These changes are often reversible, meaning the original substance can be recovered. For instance, if you freeze the melted water, it will turn back into ice. Understanding physical changes helps us recognize how materials interact in our everyday lives.