EntityQ4117933· pop 7· linked from 155 articlesEntropySign in to saveonly quantity in the physical sciences that requires a particular direction for timeConnectionsweak interactionEntitythermodynamic systemEntityirreversible processEntityshape of the universeEntitymicrostateEntitytransfer operatorEntitymathematicsEntitystarEntitytimeEntityuniverseEntityenergyEntitystatisticsEntityBlack holeConceptStephen HawkingPersongalaxyEntitygravityEntitymoleculeEntityBig BangEntityquantum mechanicsEntitytemperatureEntityCategoriesAsymmetryThermodynamic entropy