AREA III - Engineering Thermodynamics Flashcards
It deals with heat and work and these properties of substances that bear a relation to heat and work
Thermodynamics
its value for an overall system is the sum of its values for the parts into which the system is divided
Extensive property
its value is independent of the size or extent of a system and may vary from place to place within the system at any moment
Intensive property
It is a measure of the internal energy of a body
Temperature
the number of degrees above absolute zero expressed in Kelvins or Rankine.
Absolute temperature
It is the normal (perpendicular) force exerted by a fluid per unit area against which the force is exerted.
Pressure
It is the measure of pressure above zero.
Absolute pressure
It is measured above existing atmospheric pressure.
Gage pressure
What is the Standard atmospheric pressure?
101.3 kPa
mass per unit volume
mass per unit volume
volume per unit mass, reciprocal of density
Specific volume
the quantity of energy required to raise the temperature of a unit mass
by 1 K.
Specific Heat
States that when two bodies have equality of temperature with a third body, they in turn
have equality of temperature with each other.
Zeroth law
also known as the Conservation of Energy principle, states that energy can
neither be created not destroyed, it can only change forms.
First Law of Thermodynamics
It deals with the quality of energy (energy degradation).
Second Law of Thermodynamics
It states that It is impossible to construct a device that will operate in a
cycle and produce no effect other than the raising of a weight and the exchange of
heat with a single reservoir.
Kelvin-Planck statement
It states that It is impossible to construct a device that operates in a cycle and
produces no effect other than the transfer of heat from a cooler body to a hotter body.
Clausius statement
states that the entropy of a perfect crystal is zero at the absolute zero of temperature
Third law of Thermodynamics
amount of heat added to or subtracted from a substance when unit weight of the material changes 1° in temperature
Coefficient of Thermal Capacity
fraction by mass of the vapor in the liquid-vapor mixture.
Quality (x) of a two-phase mixture
The amount of heat required to change unit mass of a pure substance from the saturated liquid state to the saturated vapor state, the pressure (or temperature) remaining constant.
Enthalpy (or latent heat) of vaporization
the amount of heat required to change unit mass of a pure substance from the solid state to the vapor state, the pressure (or temperature) remaining constant
Enthalpy (or latent heat) of sublimation
the amount of heat required to change unit mass of a pure substance from the solid state to the liquid state, the pressure (or temperature) remaining constant.
Enthalpy (or latent heat) of fusion
In Boyle’s Law, which variable is constant?
Temperature