what causes a phase change?\nparticles gaining or losing heat/energy\ngravitational forces that push or pull…

Brief Explanations:

Phase changes in matter occur due to the gain or loss of heat/energy by particles. When particles gain energy, they can change from solid to liquid (melting) or liquid to gas (vaporization). When they lose energy, they can change from gas to liquid (condensation) or liquid to solid (freezing). Gravitational forces mainly affect the motion and position of objects on a large - scale and are not the cause of phase changes.

Answer:

particles gaining or losing heat/energy