Basic Concepts System, Surroundings and Universe System Surrounding Universe Open System Both mass and energy exchange exist between the System and the Surroundings Close System Only energy(not mass)exchange exists between the System and the Surroundings Isolated System Neither energy nor mass exchange exists between the System and the SurroundingsBasic Concepts  System, Surroundings and Universe  System + Surrounding = Universe  Open System  Both mass and energy exchange exist between the System and the Surroundings.  Close System  Only energy (not mass) exchange exists between the System and the Surroundings.  Isolated System  Neither energy nor mass exchange exists between the System and the Surroundings. 2