Thermodynamics Physics 47 Statistical mechanics 19 Chemistry 18 Heat 15 Engineering 11 Physical chemistry 11 Statistical physics 11 Thermochemistry 8 Chemical reactions 5 Chemistry, Physical and theoretical 5 Matter 5 Statistical thermodynamics 5 Continuum mechanics 4 Electrochemistry 4 Entropy 4 Gases 4 Kinetic Theory 4 Mechanics 4 Statistics 4 Chemical engineering 3 Chemical kinetics 3 Chemical thermodynamics 3 Fluid mechanics 3 Kinetic theory of gases 3 Kinetics 3 Mechanical engineering 3 Metals 3 Physical biochemistry 3 Quantum Mechanics 3