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Thermodynamics
Chapter 1 - 3
30
Other
Not Applicable
09/20/2007

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Term
Macroscopic energy
Definition
whole system in reference to an outside source. (KE or PE)
Term
Microscopic energy
Definition
Energy related to the molecular structure and activity.
Term
Stationary System
Definition
Closed system that has constant velocity, elevation and center of gravity. (change in E = Change in U)
Term
Latent energy
Definition
Internal energy associated with the phase of the system.
Term
Closed Systems energy interaction
Definition
Heat and Work
Term
Adiabatic process
Definition
A process in which there is no heat transfer
Term
Conduction
Definition
energy transfer from energetic particles to less energetic particles.
Term
Convection
Definition
energy transfer between a solid and a contact fluid in motion.
Term
Radiation
Definition
energy transfer due to emission of electromagnetic waves
Term
First Law
Definition
The change in internal energy for a system is equal to the heat added to the system minus the work done by the system
Term
Efficiency
Definition
E (in) / E (out)
Term
Closed System (control mass)
Definition
fixed mass
no mass transfer
Term
Isolated system
Definition
Fixed mass
No mass transfer
No energy transfer
Term
Open system (control volume)
Definition
Allows mass and energy transfer
Term
Intensive Properties
Definition
independent of mass (quantity)
Term
Extensive properties
Definition
properties that depend on size

mass, volume, momentum
Term
State postulate
Definition
the number of properties required to fix a state

simple compressible system is specified by two independent intensive properties.
Term
quasi static (quasi equilibrium)
Definition
remains close to equilibrium throughout process.
Term
Zeroth law
Definition
If A is thermally equal to B and B is thermally equal to C then A and C are thermally equal.
Term
Thermodynamic equilibrium
Definition
maintains thermal,mechanical, chemical and phase equilibrium
Term
Compressed liquid (sub-cooled liquid)
Definition
liquid is not about to vaporize
Term
Saturated Liquid
Definition
A liquid that is about to vaporize
Term
Saturated Vapor
Definition
A vapor that is about to condense
Term
Superheated vapor
Definition
a vapor that is not about to condense
Term
Saturation Temperature
Definition
the temp. at which a pure substance changes phase at a given pressure
Term
Saturation Pressure
Definition
The pressure at which a pure substance changes phase at a given temperature
Term
Latent Heat
Definition
amount of heat absorbed or released during a phase change.
Term
Critical point
Definition
saturated liquid and saturated vapor states are identical.
Term
Enthalpy of vaporization
Definition
the amount of energy needed to vaporize a unit mass of saturated liquid at a given temp. or pressure.
Term
Quality
Definition
mass of vapor / total mass of mixture
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