First Law of Thermodynamics
The First Law of Thermodynamics
Energy cannot be created or destroyed; it can only change forms.
All energy must be accounted for.
For example, accumulation of energy, ΔE, occurs when energy entering (shown as heat) is greater than energy leaving (shown as work).
We need to define a
sign conventionfor heat and for work.
First Law of Thermodynamicsis the key to analyzing all of the systems that we will consider in this chapter and the next chapter.
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