A thermodynamic process during which no heat enters or leaves the system is classified as _____________?
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Answer: C. adiabatic
Explanation
An adiabatic process is a thermodynamic change where no heat enters or leaves the system. The system is thermally insulated from its surrounding environment throughout the entire process. Any temperature changes occur entirely due to work done on or by the working fluid. Thermodynamics studies the interconversion of heat, work, and internal energy in physical systems. During rapid expansions or compressions, heat transfer is negligible, approximating ideal adiabatic conditions. The first law of thermodynamics dictates that internal energy changes equal work done when heat is zero.
Diesel engines rely on rapid adiabatic compression to heat air enough to ignite injected fuel. Weather systems create clouds and precipitation through adiabatic cooling of rising moist air masses. Engineering thermodynamic cycles like the Brayton cycle utilize adiabatic turbine expansion to generate power. Isochoric processes maintain a constant volume while pressure and temperature change inside closed containers. Isobaric processes occur at a constant pressure while heat and volume are allowed to vary freely. Isothermal processes maintain a completely constant temperature through controlled heat exchange with surroundings.
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