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--- 183_notes:define_energy [2021/03/11 05:13] – [Energy takes different forms] stumptyl
+++ 183_notes:define_energy [2021/03/11 05:15] – [The First Law of Thermodynamics (The Energy Principle)] stumptyl
@@ Line 38: / Line 38: @@
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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 ($E_{sys}$) changes as a result of work done by the surroundings ($W_{surr}$) 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 ($E_{sys}$) changes as a result of work done by the surroundings ($W_{surr}$) and the heat exchanged with the surroundings ($Q$). Mathematically, you can write this relationship as the energy principle,
 $$\Delta E_{sys} = W_{surr} + Q$$
 This principle tell you precisely how the energy of system will change as a result of interactions with the surroundings.