# Shared Flashcard Set

## Details

Formulas - Module 10
14
Physics
02/14/2008

Term
 W =
Definition
 P*ΔV(pressure times change in volume)
Term
 The First law of thermodynamics
Definition
 Energy cannot be created or destroyed. It can only change form.
Term
 The Second law of thermodynamics
Definition
 The entropy of the universe must always either increase or remain the same. It can never decrease.
Term
 ΔU =
Definition
 ΔU = q - W where ΔU is change in internat energy of the system
Term
 1. When work is positive2.  When work is negative
Definition
 1. the system does work on the surroundings2. the surroundings do work on the system
Term
 The work done whan a gas changes states =
Definition
 The area beneath a P-V cuve
Term
 Isobaric process
Definition
 A process which occurs at constant pressure (P is constant use E10.4 to find W)
Term
 Isothermal process
Definition
 A process which occurs at constant temperature ΔU = 0
Term
 Isochoric process
Definition
 A process which occurs at constant volume W = 0
Term
Definition
 A process in which no heat is transferred between the system and the surroundings q = 0
Term
 ΔSrev =
Definition
 q/T
Term
 efficiency =
Definition
 Work Done / Total Energy Input = (qh - qc)/qh = 1 - qc/qh
Term
 ecarnot =
Definition
 1 - Tc/Th
Term
 The Third law of thermodynamics
Definition
 Is is impossible to reach a temperature of 0 K in a finite number of cooling steps
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