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We trapped 28 kg of dry air, and it initially has standard pressure and temperature. The trapped air parcel rises in the atmosphere until the temperature is 188 K. What is the change in entropy if the pressure decreases by 28% after the parcel rises?

We trapped 28 kg of dry air, and it initially has standard pressure and temperature. The trapped air parcel rises in the atmosphere until the temperature is 188 K. What is the change in entropy if the pressure decreases by 28% after the parcel rises?

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We trapped 28 kg of dry air, and it initially has standard pressure and temperature. The trapped air parcel rises in the atmosphere until the temperature is 188 K. What is the change in entropy if the pressure decreases by 28% after the parcel rises?

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Step 1

Given :

   Mass of the dry air trapped, m = 28 kg

   The trapped dry air, initially has standard pressure and temperature, i.e., 

               Initial pressure, Pi = 1.013×105 Pa

               Initial temperature, Ti = 273K

     The trapped air parcel rises in the atmosphere up until the pressure and temperature are :

               Final pressure, is decreased by 28% of the initial pressure, 

                              Pf =100-28100 × 1.013×105 Pa   Pf = 72936 Pa

               Final temperature, Tf =188 K

Determine the change in entropy.

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