# AP Physics B - Thermo

 The flashcards below were created by user CCQuizbowl on FreezingBlue Flashcards. Kelvin conversion Heat transfer equation Heat necessary for phase change L is the latent heat of the phase change Linear expansion Volume expansion Heat transfer rate k is the thermal conductivity, A is cross-sct area, L is length, T is temp. difference between two sides Ideal gas law KELVINS Boltzmann's constant average kinetic energy of ideal gas KELVINS root-mean-square speed KELVINSM is molar mass (in kg), mu is molecular mass Liter 0.001 cubic meters Ideal gas at STP 22.4 L at 1 atm and 273 K Zeroth law of thermodynamics Transitive property of thermal equilibriumHeat flow = 0 in closed systems Work done by ideal gas (heat must be removed) Positive when work is done on system, negative when system does work Work when pressure changes Area under P-V curveIncreasing volume gives negative work, decreasing volume gives positive work First law of thermo No phase changes.For constant volume, W=0 and Isochoric process No change in volumeChange in internal energy due entirely to heat transfer Isothermal process No temperature changes Adiabatic process Q = 0 Efficiency of heat engines Q_H is heat energy discarded Carnot cycle 1. Isothermal expansion (absorbs heat from high-energy source and expands; because temp doesn't increase, all heat goes into work performed by expanding gas) 2. Adiabatic expansion (system expands w/o exchanging heat w/ surroundings; it thus does negative work, so its internal energy and temperature decrease) 3. Isothermal compression - environment does work on gas, and it discards heat to low-temperature reservoir rather than increasing internal energy 4. Adiabatic compression - system compressed to initial state with no heat exchange, so its internal energy and temp increase Carnot efficiency KELVINS AuthorCCQuizbowl ID150039 Card SetAP Physics B - Thermo DescriptionThermodynamics Updated2012-04-25T15:22:47Z Show Answers