Kinetic Particle Theory

KPT

The kinetic particle states that all matter is made up of tiny particles and that these particles are in constant random motion.

Models

- physical model
- scale model (e.g. map
- computer model
- mathematical model (e.g. Schroedinger's equation)

Limitations of models:
Do not represent nature in every aspect
Subject to revision or rejection when there is new information

Solid Particles

- packed closely together in orderly arrangement
- held together by forces of attraction
- vibrate about their fixed positions but not free to move amongst each other

Liquid particles
- packed quite closely together but not orderly arrangement
- held together by forces of attraction
- more energy than solid particles
- are able to move (by rolling and gliding) throughout the liquid

A scientific model is:

• A representation, a prototype of replace in the object/phenomenon that could well-explain its physical properties 
• phenomenon includes physical phenomenon

Assumptions

valid statements to set the parameter for the model to work. Without the assumptions, the principles of the model becomes invalid or irrelevant.

Limitations

features of the model not able to illustrate the principles of phenomenon.

Assumptions of the kinetic particle model

• Particles are in constant motion and in random direction.
• Particles possess kinetic energy.
• Forces of attraction exist between the particles.
• Heavier particles travel slower than lighter particles.
• Particles do not stick to each other after collision (elastic collision).
• Particles do not stick when the walls of container and bounces bacl after collision with the walls of container.
• Particles travel in a straight line.
• Particles are small and big.

Limitations of KPM

• Forces of attraction between particles are not seen in the model. (only static picture can be shown clearly on animations)
• Movement of particles in terms of direction and speed may not be accurately captured on static picture but can be shown clearly on animation
• Distance between particles in model may not be scaled accurately to the accurately distance between particles.