**Kinetic Molecular Theory (KMT):**

An attempt to explain gas behavior.

**Kelvin (K):**

Temperature scale used in gas calculations. Has an absolute zero. °C + 273 = K

**Pressure:**

Force of gas molecules colliding with surfaces

**Atmospheric pressure:**

Pressure due to the layers of air in the atmosphere

**Standard Temperature and pressure:**

1 atm (or anything it’s equal to) and 0°C (273 K)

**Ideal Gas:**

All assumptions of the kinetic molecular theory are true.

**Molar Mass (Molecular Mass):**

Grams per mole for a molecule.

**Density:**

Mass per volume of a sample

**Average Translational Kinetic Energy (KE**_{ave}):

Average kinetic energy (energy due to motion) of each particle.

**Root-Mean-Square Speed (V**_{rms}):

One measure of average particle speed in a gas

**Maxwell’s Probability Distribution:**

Probability function that indicates the probability that a particle in a gas will be moving at a certain speed.

**Real Gas:**

Real gases have significant particle volume and significant attractions/repulsions

**Diffusion:**

The rate at which a gas travels through a container

**Effusion:**

The rate at which a gas escapes through a tiny hole