Collision energy refers to the amount of kinetic energy that particles or objects have when they collide with each other. In the field of physics and chemistry, collision energy is an important factor in understanding and predicting the outcomes of interactions between particles, such as in chemical reactions or nuclear collisions. By controlling the collision energy, researchers can determine the types of reactions that occur, the products formed, and the overall energy balance of the system. Collision energy is typically measured in units such as electron volts (eV) or joules (J) and is a key parameter in many experimental studies and simulations involving collisions between particles.