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P-V Diagrams and processes Contents:Basic Concept Example Whiteboards
P-V diagrams Isobaric Expansion (+W) Isobaric Compression (-W)Volume Pressure Isobaric Expansion (+W) Isobaric Compression (-W) Iso = same baric = pressure The axes Change volume? Change pressure? TOC
P-V diagrams Pressure Volume Isochoric = same volume(closed container) how does it happen? TOC
Adiabatic (no heat flow) processesVolume Pressure Adiabatic expansion: (Q = 0) Work is done by the gas (+W) No heat flows in: Q = U + W 0 = U + W, U = -W Internal energy (T) drops Examples Air rockets Cold side of fridge Universe Demo - cloud TOC
Adiabatic (no heat flow) processesVolume Pressure Adiabatic compression: (Q = 0) Work is done on the gas (-W) No heat flows in: Q = U + W 0 = U + W, U = -(-W) Internal energy (T) rises Examples Bike pump/diesels Hot side of fridge Compressors Demo – plunger/Murray Frig TOC
Isothermal (constant temperature) processesVolume Pressure Isothermal expansion: (T = 0) Work is done by the gas (+W) Internal energy is constant (U = 0) Q = U + W = W Heat turns to work (slowly) TOC
Isothermal (constant temperature) processesVolume Pressure Isothermal compression: (T = 0) Work is done on the gas (-W) Internal energy is constant (U = 0) Q = U + W = W Work turns to heat (slowly) TOC
heat flows in, temp increasesWhat’s goin’ on here? Volume Pressure isobaric expansion heat flows in, temp increases TOC
heat flows out, pressure dropsWhat’s goin’ on here? Volume Pressure isochoric cooling heat flows out, pressure drops TOC
isochoric heating, isobaric expansionWhat’s goin’ on here? Volume Pressure isochoric heating, isobaric expansion TOC
Which process is adiabatic, which is isothermal?Volume Pressure A B In which process would the temperature drop? B is adiabatic TOC
Which process is adiabatic, which is isothermal?Volume Pressure B A In which process would the temperature increase? B is adiabatic TOC
Complete cycle - where is work done? A complete cycle: Volume Pressure C B A D Complete cycle - where is work done? Is more work done by gas or on the gas? TOC
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P-V Diagrams and processes C ontents: Basic Concept Example Whiteboards.
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