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6) This is a
Transcribed Image Text:6. Write the First Law of Thermodynamics in terms of in-
ternal energy, work, and heat.
Transcribed Image Text:4.2. Internal Energy and the First Law
If heat is added to an air parcel by conduction, radiation or any other means, then the parcel's internal energy (U) will ir
crease, or the parcel will perform work (by expanding its volume), or both (see Figure 4.1). This can happen with either a
open or closed parcel – both allow the passage of energy from the surrounding environment into the parcel – but not a
isolated parcel.
-
dq
du
da
Figure 4.1. Addition of heat (dq) to an open or closed parcel. Parcel may respond by experiencing a change in internal energy
(du), perform work by expanding (da), or both.
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