An Introduction to Atmospheric Thermodynamics by Anastasios Tsonis

By Anastasios Tsonis

Textbook for brief undergraduate classes in atmospheric technology, meteorology, physics or average technology courses.

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What is the change in the temperature of the air and what is the amount of heat absorbed? 33 cal) Calculate the change in specific energy of an adiabatic parcel whose speed changes from 10 m s−1 to 25 m s−1 .

Because of this from now on we will denote the incremental change in work as δW not as dW . 1) dt dt where v denotes the velocity of the parcel and K is the kinetic energy of the parcel. It follows that the work done and the kinetic energy are related. The last equation indicates that one way by which a thermodynamic system can exchange energy with its environment is by performing work. The other is through transfer of heat. More on that will follow soon. 1) the units for work are those of energy.

4 cV d = 718 J kg−1 K−1 = 171 cal kg−1 K−1 cpd = 1005 J kg−1 K−1 = 240 cal kg−1 K−1 Rd = 287 J kg−1 K−1 . 21) becomes (Cp − nR∗ )dT + (nR∗ dT − V dp) = δQ or Cp dT − V dp = δQ. 1 summarizes all the different expressions of the first law. 1. 6 Consequences of the first law Let us look at the form of the first law in the following special cases. 21) it follows that δQ = δW . Then the amount of heat exchanged is f f δW = Q= pdV i i or f Q = nR∗ T i dV V or Q = nR∗ T • Isochoric transformations: i ln Vf .

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