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1.1 Thermodynamic System(��댁��������怨�)

*Free body (diagram) in mechnics
= ��� =0
(Newton`s 2nd law of motion)
*System in Thermodynamics

1)Closed System(諛����怨�)

- fixed mass
- no mass transfer
- energy transfer
- control mass (寃���ъ�����, 怨����吏����)
thermodynamic universe = sys + surr
(��댁�������� ��곗＜) (怨�) (怨���� �����μ�� 誘몄����� ������ 踰����)

2)Isolated System(怨�由쎄��)

- Special case of the closed System
- no mass transfer
- no energy transfer
- does not interact with surroundings

3)Open System

- energy and mass transfer
- fixed volume
- control volume(寃���ъ껜���, 怨����泥댁��)
- flow system(������怨�)


-choice of C.V depend on convinience of analtsis

1.2 property, state, process, and equilibruim

(臾쇱�깆��, ������, 怨쇱��, 洹몃━怨� ������)
*Properties - macroscpic characteristics of system
(臾쇱�깆��) mass, volumme, energy, pressure, ���(������)