Lecture 4-5 Work, Energy

Unstable process ways the state can change l

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Unformatted text preview: s no confusion, the system (controlled mass) is defined as follows: Control Mass l༆  A fixed collecPon of atoms (or molecules) l༆  Completely surrounded by a control surface l༆  Nothing can get in or out except for photons l༆  Control mass can be air, water, whatever…. Control Mass l༆  Has a set of properPes that can be measured e.g. l༆  Pressure l༆  Volume l༆  Temperature l༆  Density l༆  Mass l༆  Together the set of all measurable properPes define the “state” of the system l༆  Earth events, e.g. thunderstorms, earthquakes, hurricanes, – are all changes of that state l༆  ConvenPon: Energy transferred to the system defined as posi4ve, and from the system as nega4ve How does the State Change? l༆  First of all it follows a process – a sequence of states that leads from an iniPal state to a final state. l༆  E.g. A control mass made of H2 and O2 in an iniPal state. If there is enough H2 then at some point your final state will be H2O. l༆  There is one special kind of process called a cycli...
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