# Parker Science chapter 3

## 20 terms

### Crystalline

Very orderly arrangement

### Amorphous

Not orderly arrangement

### Surface Tension

Force between particles on the surface of a liquid

### Viscosity

Liquids resistance to flow

### Hydraulics

Brake systems in cars, pressure on one end causes on the other end

### Pressure

The amount of force exerted on a given area

### Boyle's Law

For a fixed amt. of gas at constant temp., the volume of a gas increases as it pressure decreases.

### Charle's Law

For a fixed amt. of gas at constant pressure., the volume of a gas changes

### Plasma

No definite shape and no definite volume. The particles burst open.Examples of plasma is lightning,fire, aurora borealis, and fluorescent lights. Stars are also a good example of plasma

### Changes of State

Conversion of a substance from one physical form to another

### temperature

The measure of how the particles are moving

### Endothermic

A reaction that takes energy in( heating)

### Exothermic

This gives off energy( losing energy)

### Melting

Solid to liquid( like ice melting back to ice). Solid substance takes in energy and becomes liquid. This happens at melting pt. Substances have a specific melting point zero degrees

Liquid to gas

### Boiling

Vaporization that occurs throughout the liquid. The temp. This occurs at is called the boiling pt. Water is 100degrees celsius

### Evaporation

Vaporization that occurs at the surface of a liquid below its boiling pt.

### Sublimation

Solid directly to a gas

### Freezing

Liquid to a solid. Particles lose energy, get closer together and become a solid

### Condensation

Gas to a liquid. Condensation pt. Is the temp. At wich a fas become s a liquid. Ex: water is 100degrees Celsius. Gas particles slow down, begin to clump together and form a liquid Ex: cold glass on a hot day.