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183_notes:define_energy [2021/03/11 05:15] – [The First Law of Thermodynamics (The Energy Principle)] stumptyl | 183_notes:define_energy [2021/03/17 20:43] (current) – [The First Law of Thermodynamics (The Energy Principle)] stumptyl |
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==== The First Law of Thermodynamics (The Energy Principle) ==== | ==== The First Law of Thermodynamics (The Energy Principle) ==== |
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{{ 183_notes:system_and_surroundings.002.png?300}} | {{ 183_notes:week7_sysvssurroundings.png?300}} |
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The first law of thermodynamics (or the energy principle) governs when energy moves into and out of systems. In other words, __**the work that is done is equal to the energy that is transferred or transformed.**__ For this to make sense, you have to define a system and track how the energy of that system (Esys) changes as a result of work done by the surroundings (Wsurr) and the heat exchanged with the surroundings (Q). Mathematically, you can write this relationship as the energy principle, | The first law of thermodynamics (or the energy principle) governs when energy moves into and out of systems. In other words, __**the work that is done is equal to the energy that is transferred or transformed.**__ For this to make sense, you have to define a system and track how the energy of that system (Esys) changes as a result of work done by the surroundings (Wsurr) and the heat exchanged with the surroundings (Q). Mathematically, you can write this relationship as the energy principle, |
ΔEsys=Wsurr+Q
| ΔEsys=Wsurr+Q
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This principle tell you precisely how the energy of system will change as a result of interactions with the surroundings. | This principle tells you precisely how the energy of the system will change as a result of interactions with the surroundings. |