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16 Cards in this Set

  • Front
  • Back
Study of heat is its transformation to mechanical energy, characterized by two principle laws:
a) A restatement of the law of conservation of energy as it applies to systems involving changes in temperature: whenever heat is added to a system it transforms to an equal amount of some other form of energy.
b) Heat cannot be transferred from a colder body to a hotter body without work being done by an outside agent.
Thermal Equilibrium
State wherein substances in thermal contact have reached a common temperature.
Warm, dry wind that blows down from the eastern side of the Rocky Mountains across the Great Plains.
Generator that is powered by a turbine.
Thermal Pollution
Undesireable heat expelled from a heat engine or other source.
Term applied to expansion or compression of a gas occurring without gain or loss of heat.
Fahrenheit Scale
Temperature Scale in common use in the United States. The number 32 is assigned to the melt-freeze point of water, and thenumber 212 to the boil-condense point of water at standard pressure (1 atmosphere at sea level)
Absolute Zero
Lowest possible temperature that any substance can have; the temperature at which the atoms of a substance have their minimum kinetic energy. The temperature of absolute zero is 273.15°C which is -459.7°F and 0 k.
Internal Energy
The total energy stored in the atoms and molecules within a substance. Changes in internal energy are of principal concern in thermodynamics.
Adiabatic Process
Process, often of fast expansion or compression, wherein no heat enters or leaves a system. As a result, a liquid or gas undergoing an expansion will cool, or undergoing a compression will warm.
Heat Engine
A device that uses heat as input and supplies mechanical work as output, or that uses work as input and moves heat "uphill" from a cooler to a warmer place.
Temperature Inversion
Condtion wherein upward conversion of air is stopped, sometimes because an upper region of the atmosphere is warmer than the region below it.
A measure of the disorder of a system. Whenever energy freely transforms from one form to another, the direction of transformation is toward a state of greater disorder and therefore toward one of greater entropy.
Ideal Efficiency
Upper limit of efficiency for all heat engines; it depends on the temperature difference between input and exhaust.
Carnot Efficiency
Ideal maximum percentage of input energy that can be converted to work in a heat engine.
Paddle wheel driven by steam, water, etc. that is used to do work.