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OAT Physics

Chapter 4 - Thermodynamics

TermDefinition
Thermodynamics study of heat and its effects
1st Law of Thermo conservation of E during heat transfer; E = Q - W
Thermal Expansion increase in length by a solid due to temp increase; change in L = alpha L change in T
Volume Expansion expansion of a liquid when heated; change in V = beta V change in T
Heat E transfer btwn two objects as a result of a diff in temperature
Conduction direct transfer of E from molecule to molecule thru collisions
Convection heat transfer thru mass motion of heated materials; only liquids and gases
Radiation transfer of heat via electromagnetic waves
Conversion of heat units 1 kcal = 1 Cal = 4184 J
heat equation Q = mc change in T; only if phase of object stays the same
Heat of Transformation Q = mL where L is the heat of transformation
heat of vaporization liquid to gas and vice versa
heat of fusion solid to liquid and vice versa
Pressure = F/A
1 atm = 760 torr, 1.013E5 Pa
Work done by the system increases V; positive Work
Word done on the system decreases V; negative Work
Net Work done by a gas = work done by system - work done on system
Constant Pressure isobaric
Adiabatic (constant T) Q = 0
Constant V W = 0
Closed Q = W
Entropy measure of disorder; a system can either increase (irreversible) or remain the same (reversible processes) in this
Entropy Eq change in S = Q/T; no mass needed and change in phase means T is constant
Created by: JaeBae4444
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