Isothermal Isobaric Isochoric Adiabatic Processes.pptx
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An isothermal process keeps temperature constant by changing both pressure and volume simultaneously and oppositely, according to Boyle's law. An isobaric process keeps pressure constant by adding heat which increases the gas's internal energy and does work as its volume changes. An isovolumetric or isochoric process keeps volume constant, so no work is done and internal energy changes solely from heat. An adiabatic process is fully insulated so no heat enters or leaves; nothing is constant and internal energy changes result only from work done.
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- 1. Thermodynamic Processes - Isothermal To keep the temperature constant both the pressure and volume change to compensate. (Volume goes up, pressure goes down) i.e. BOYLES’ LAW P V 0 2 1 Isotherm Isothermal T1 = T2 (Constant Temperature) V1 V2 T1 = T2 Q -W 0 T 0 U V Since By W Q U By W Q 0 By W Q Net Work Done
- 2. Thermodynamic Processes - Isobaric Heat is added to the gas which increases the Internal Energy (U). Work is done by the gas as it changes in volume. The path of an isobaric process is a horizontal line called an isobar. 0 2 1 V1 V2 Isobar T1 T2 T2>T1 Q -W Isobaric P1 = P2 (Constant Pressure) By W Q U P V Net Work Done
- 3. Thermodynamic Processes – Isovolumetric (Isochoric) 0 2 1 V1= V2 Isomet T1 T2 T2>T1 P V Isovolumetric V1 = V2 (Constant Volume) Q W = 0 0 V Since By W Q U 0 Q U Q U
- 4. Thermodynamic Processes - Adiabatic ADIABATIC- GREEK (adiabatos- "impassable") In other words, NO HEAT can leave or enter the system, it is fully insulated. 0 V1 V2 P V Adiabatic = Nothing is Constant T1 T2 T1>T2 2 1 Adiabat Q = 0 -W 0 Q Since By W Q U By W U 0 By W U
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