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MU PHY 182 - Gas Processes and Heat Transfer

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PHY 182 1st Edition Lecture 6 Outline of Last Lecture I. Specific Heat of GasesII. Introduction to Adiabatic ProcessesIII. How to Solve Calorimetry ProblemsOutline of Current Lecture I. Gas ProcessesII. Adiabatic ProcessesIII. The Three Types of Heat TransferCurrent LectureGas Processes- If you have two systems, both with all the same initial conditions and one goes through an isobaric process and one goes through an isochoric process, the isochoric system would have a higher final temperature.- A gas's Cp and Cv just depend on whether it is diatomic or monatomic.- Cp=Cv+R for all gases- Since the change in thermal energy is the same for all processes that have the same change in temperature, we can write that ΔEth=nCvΔT. Note that this equation can be used for all ideal-gas processes, not just isochoric processes.Adiabatic Processes- In an adiabatic process, no heat is transferred to or from the system (Q=0).- An adiabatic process occurs when either the system is thermally isolated or the process is performed very quickly.- For an adiabatic process, ΔEth is equal to the work so W=nCvΔT- Specific heat ratio is the isobaric specific heat of a gas divided by the isochoric specific heat. This value is 1.67 for monatomic gases and 1.40 for diatomic gases.- When analyzing engines, it is important to know its compression ratio, the ratio of the highest volume in the cylinder to the lowest volume in the cylinder.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.The Three Types of Heat Transfer- Heat can be transferred through conduction, convection, or radiation.- Conduction is defined as heat transfer that happens when two objects are directly touching- To calculate the rate of heat transfer, one of the variables you must know is the thermal conductivity of the object. Thermal conductivity is a quality that defines how well heat flows through an object.- The second type of heat transfer is convection. Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity that leads to the transfer ofheat.- Convection occurs in all fluids but it does not occur in solids.- Radiation, the third type of heat transfer, is a type of energy that all objects are emitting at all times.- The amount of radiation emitted by an object depends very strongly on the object's temperature.- A blackbody is an object with a emissivity of 1, which means that it is a perfect emitter of


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