The system of rules which a particular country recognizes as regulating the actions of its members.

Statements describing the relations between the forces acting on a body and the motion of the body, first formulated by English physicist and mathematician Isaac Newton.

Laws that relate the pressure, volume, and temperature of a gas.

Also called private international law, the existence worldwide, and within individual countries, of different legal traditions, different specific rules of private law, and different systems of private law.