extensive properties >>> properties that do depend on the amount of matter present (varies directly with mass)
ex: mass, weight, volume, length, total internal energy
intensive properties >>> properties that do NOT depend on the amount of matter present (independent of mass)...
Variation of pressure with elevation >>> dP/dz = -ρg
total energy >>> sum of all forms of energy of a system (internal, kinetic, and potential)
internal energy >>> molecular energy of a system, may exist in sensible, latent, chemical, and nuclear
forms
mechanical energy >>> form of energy that can be converted to mechanical work completely and
directly by a mechanical device such as an ideal turbine
ways that energy can cross boundary of a closed system >>> heat or work
pure substance >>> substance that has a fixed chemical composition throughout
exists in different phases depending on energy level
compressed/subcooled liquid >>> liquid that is not about to vaporize
superheated vapor >>> gas that is not about to condense; temperature and pressure are independent
of each other
saturation temperature and pressure >>> temperature/pressure that a substance changes phase at
saturated liquid and vapor >>> during boiling process, both liquid and vapor coexist in equilibrium
pressure and temperature dependent on each other
in absence of compressed liquid data... >>> treat compressed liquid as a saturated liquid at the given
TEMPERATURE
critical point >>> state beyond which there is no distinct vaporization process
above this point, vapor and liquid are indistinguishable
triple line >>> all three phases of a substance coexist in equilibrium (triple line is temperature and
pressure)
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