Set the syringe firmly on its base on the table and had someone click start. Wai

Question

Set the syringe firmly on its base on the table and had someone click start. Waited a second or two and then firmly and quickly pushed the syringe all the way down with hand. Held the syringe in this position until the both the temperature and pressure equalized and were no longer changing. Released the syringe and let it rise on its own. When the pressure and temperature again both stopped changing, clicked stop.....

a) Explain the temperature and pressure curves. Why do the pressure and temperature first go up and then decrease? Why, after the syringe is released does the pressure and temperature go down?.... **please help will vote lifesaver**

Explanation / Answer

Read carefully, have written it myself: Initially, Pressure and Temperature rise due to compression of the air in the syringe. When you hold the syringe in its compressed position, the Temp and Pressure values fall due to heat lost to the surrounding. Now, when you release the syringe, the compressed air in it expands, suddenly at first, and gradually later, to almost starting pressure and temp (Almost, because by the end of the expansion, friction of the syringe wall is too much to be overcome by whatever pressure is left in the syringe). Hence the fall in Pressure and Temperature after release.

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