Ho+Seung's+Patterns+in+Chemicals

 the relative amount by which the density of an elastic medium varies from its average value as a sound wave passes through it.


 * Solid**
 * The particles in a solid are packed tightly in a fixed pattern which are held with strong forces together, so they can't leave their positions. The only exceptions are tiny vibrations. **


 * Liquid**
 * The particles in a liquid can move around and slide past each other. They are still near each other but not like solid particles, they are not in fixed positions and the particles are held by weaker forces. **

The gas particles are far apart, and they move about farely quickly. Almost no forces are holding them which will make them collide with eache other and boune off in all directions.
 * Gas**

**Touch** Solid: Solid objects are hard and can be touched.

Liquid :Liquids are moist but you can't grab it.

Gas :Gas can't be touched.

__**Key words**__ **explanation

Particle : extremely small constituents of matter, such as atom. Compres  **s**: to press together by force. Expand : to increase in size or volume. Boiling point : the emperature at hich a liquid starts to boil. Condensation :** drops of water that form on a cold surface when warm waer vapour becomes cool.

The act of converting the solid directly to the gas state without going through the liquid stage.
 * __Questions: __**
 * What is sublimation? **

If you give more pressure above the boiling water and block the space to escape as a gas, then the movement of the particle will be reduced and they will need extra heat to reach the boiling point to be converted as a gas state.
 * Supposing you increased the pressure of the air above the boiling point of the water? **

** Imagine that you are trying to boil water for a cup of tea up a mountain. Why would the cup of tea be fairy horrible? ** When you are up in the mountain there is less oxygen supply so as a consequence, the boiling point goes down. The

**Does water contract or expand on changing from a liquid to a solid?**