Particle model of ideal gas This java simulation use 1 to 200 particles to simulate the particle of ideal gas. Each particle has the same speed moving in random direction. Piston will move down due to the gravity and move up because collision from particles. You can change the velocity and pressure with the slider bar Try to estimate the number of particle per cubic centimeter and compare to the number of particle in this simulation. Explain why the volume in the simulation is changing all the time. New Model customized by lookang for the following: Assumptions of ideal gas 1. The molecules in the gas can be considered small hard spheres. 2. All collisions between gas molecules are elastic and all motion is frictionless (no energy is lost in collisions or in motion). 3. Newton’s laws apply. 4. The distance between molecules on average is much larger than the size of the molecules. 5. The gas molecules are constantly moving in random directions with a distribution of speeds. 6. There are no attractive or repulsive forces between the molecules or the surroundings. Additional option in applet to change elastic to inelastic (i.e. coefficient of restitution), p-V, p-T and V-T graphs