Base
A compound that yields OH- ions in solution or a solution with the concentration of OH- exceeding H+.

Beta particle
An electron emitted from a nucleus in one type of radioactivity.

Boiling point
The temperature at which a liquid changes to a gas.

Boiling point elevation
An increase in the boiling point of a solution, proportional to the concentration of solute.

Boyle's Law
The volume of a gas varies directly with temperature.