or breaking glass are physical changes because they do not alter the fundamental nature of the material. Reversible: Physical changes can often be reversed by reversing the process that caused ...

They cannot be undone. For example you cannot change a cake back into its ingredients again. Image caption, Freezing is a reversible change. For example you can freeze juice to make ice lollies.

Scientists from the Technical University of Darmstadt in Germany and Roskilde University in Denmark used dynamic light scattering and tracked fluctuations in the “physical aging” process of ...

These DNA modifications are normally fixed, but research published today in Nature Neuroscience 1 reveals the first example of reversible changes to ... marks in human physical and psychological ...