Citation:
This refers to the process where atoms or molecules (particles) change their structure, arrangement, or energy state. This can occur through chemical reactions, phase changes, or nuclear reactions.
A process that leads to the transformation of one set of chemical substances to another.
A transition of matter from one state (solid, liquid, gas) to another.
Nuclear Reaction: A process in which two nuclei or nuclear particles collide to produce products different from the initial particles.