Term

What is the particle model of matter?

Definition

Solids: Particles are closely packed and vibrate in fixed positions. Liquids: Particles are close together but can move past each other. Gases: Particles are far apart and move rapidly in random directions.

Term

what is internal energy?

Definition

Internal energy is the total energy stored in the particles of a substance it consists of: Kinetic energy (movement of particles) Potential energy (forces between particles)

Term

How does gas pressure arise?

Definition

Gas pressure is caused by particles colliding with the walls of their container.