Gases - Gas Laws |

Science Standards
# Concept Definition

###### Study the primary definition of this concept, broken into general, basic, and advanced English definitions. Also see the mathematical definition and any requisite background information, such as conditions or previous definitions.

Pressure, volume, and temperature are all related. This is a combination of Boyle's Law, Charles' Law, and Gay-Lussac's Law.

In a sealed container, changing two of the variables--pressure, temperature, or volume--will change the third according to the formula in Mathematical Definition.

**Ideal Gas**

An "ideal gas" is a gas in which:

- All collisions are totally elastic (particles always bounce off each other)
- There are no intermolecular attractions (a particle can only change direction when it collides with another particle)
- The molecule is infinitely small (particles will come all the way together before they collide)

What does this mean? An ideal gas is a collection of super-small bouncy-balls that never stop bouncing.

These depend on the Combined Gas Law:

- Car (combustion) engines
- Breathing
- Projectiles (guns, cannons)
- Cooking
- Balloons

For more on how each one depends on gas laws, see the individual gas law pages.

Changing two of the three variables--pressure, temperature, or volume--has an effect on the third which can be explained and predicted by combining other gas laws.

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