Kepler’s second law of planetary motion, in astronomy and classical physics, one of three laws describing the motions of the planets in the solar system and which states that a radius vector joining any planet to the Sun sweeps out equal areas in equal
The third law of thermodynamics constrains the phase diagram of systems with a first-order quantum phase transition. For a zero conjugate field, the coexistence curve has an infinite slope at T = 0. If a tricritical point exists at T > 0, then the associated tricritical wings are ...