Systems and Properties Flashcards
What is a system
Part of the universe defined by a boundary
What is a closed system
A system where mass does not cross the boundary
What is an open system
A system where mass DOES croshh the boundary, it may leave or enter.
Difference between intrinsic and extrinsic properties
Intrinsic: Property is not dependent on mass
Extrinsic: Property is dependent on mass
List of intrinsic properties
Temperature (K)
Pressure (Pa = N/m^2)
Velocity (m/s)
List of extrinsic properties
Internal Energy (J/kg) Volume (m^3) Mass Entropy (J/K) Enthalpy (J)
What is a specific property
Property/mass
What is enthalpy
The sum of internal energy and flow work (energy required to force mass in/out of system against pressure). Measured in J
H = U + PV enthalpy = internal energy + (pressure)(volume)
What is entropy
A measure of chaos and irreversibility. Measured in J/Kg.
What is an ideal gas
Gas that never liquefies no matter how much it is cooled or compressed.
PV=nRuT P - pressure V-volume n - number of molecules Ru - universal gas constant T - temperature
How to calculate gas constant
Ru = 8.314
R = kNa k = Boltzmanns Constant, 1.38*10^-23 J/K Na = Avogadro number, 6.022*10^23
What is Mayers Relation
R = Cp - Cv
Cp = specific heat capacity at constant pressure Cv = specific heat capacity at constant volume
