In the world of science, there are 2 kinds of changes that happen in a substance. The physical and the chemical.
Now, let’s differentiate the two Physical change happens when the physical mass and texture of a certain thing changed without changing the chemical state of the said thing. While chemical change happen when the chemical of the substance change even without changing its physical state.
Physical state happen for example: If a water will be put in the freezer, the water will be frozen and become solid, the physical state of the water changes but the nothing happened in the chemical.