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NewLab8 - Lab 8 Gas Compression and Expansion Performed on...

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Lab 8 – Gas Compression and Expansion Performed on 03/02/12 Due on 03/09/12 Participants: Brian Wilhelm Andy Gutting Weston Wands Brian Cosey David Bonsaver Contributions: See Appendix B
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Abstract: For this lab, pressure measurements were taken for gasses that were either expanded or compressed in both adiabatic and isothermal systems. First predictions were made for the pressure values, then compared to the actual values measured. The differences between the values were analyzed. The isothermal compression and expansion was an imperfect scenario of the isothermal process. The change in temperature was found to be the following: Δt compression = 6.56K and Δt expansion =-6.54K. When compressed, the work done on the system was found to be -1J. Conversely, the work done on the system while expanded was 1 J. Introduction: The laws of thermodynamics describe the situations and properties of expanded and compressed gas. These ideas have helped shape our modern society in many ways, and are therefor important to understand. This lab focuses on the isothermal and adiabatic processes that are involved when changing the pressure of air by increasing or decreasing the amount of air within a syringe. A compression or expansion that takes place under constant temperature is called isothermal. This was accomplished by changing the amount of air in the syringe slowly so as to not increase or decrease the temperature. The physical equation for the isothermal process is as follows: p 1 v 1 = p 2 v 2 (1) Conversely, if the compression or expansion takes place under constant volume, the process is called adiabatic. This was accomplished by changing the amount of air in the syringe quickly so as to maintain a constant amount of energy in the system. The physical equation for the adiabatic process is as follows: p 1 v 1 γ = p 2 v 2 γ (2) Work is also done on the system during the isothermal process because of the change in temperature, and both expansion and compression can be expressed via the following equations: W compression = -p 1 v 1 ln (v 2 /v 1 ) (3a) W expansion = p 1 v 1 ln (v 2 /v 1 ) (3b) The work done during an adiabatic process is equal to -ΔU, as there is no heat transfer either into or out of the system. It is important to remember that during an isothermal process that the work done is equivalent to the heat supplied because ΔU=Q-W where ΔU=0 so Q=W. During an adiabatic process
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NewLab8 - Lab 8 Gas Compression and Expansion Performed on...

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