1.1 Systems and Surroundings S.J.T.U. Phase Transformation and Applications A system:any portion of space or matter set aside for study How the system is defined -Open system:matter is allowed to enter or leave - Close system:no matter enters or leaves A bottle of water? .Surroundings:everything else SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 1 First law I 15/38Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 1 First law I 15/38 1.1 Systems and Surroundings •Surroundings: everything else • A system: any portion of space or matter set aside for study < How the system is defined – Open system: matter is allowed to enter or leave – Close system: no matter enters or leaves A bottle of water?