Work done During an adiabatic Process.pptx
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This document discusses work done during an adiabatic process. It defines an adiabatic process as one where no heat is exchanged between a system and its surroundings. The document states that for an adiabatic expansion, work is done by the system so its internal energy decreases, while for an adiabatic compression, work is done on the system so its internal energy increases. It also explains that the work done in an adiabatic process depends only on the initial and final temperatures of the system.
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3) The first law states that the change in internal energy of a system is equal to the heat supplied minus the work done.
Thermodynamics 1
This document discusses key concepts in thermodynamics. It defines thermodynamics as the branch of physics dealing with the conversion of heat into useful work. The document outlines important thermodynamic concepts like system, surroundings, heat, work, state variables, processes (reversible, irreversible, cyclic), and laws (zeroth law, first law). It provides equations to describe processes like isothermal, adiabatic, isobaric, and isochoric. The first law of thermodynamics relates the changes in internal energy, heat, and work in a system.
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- 2. The system does not exchange heat with the surrounding System is thermally insulated from the surrounding Adiabatic Process • An adiabatic process transfers no heat ΔU = Q – W – But Q = 0 , → ΔU = – W When a system expands adiabatically, W is positive (the systemdoes work) so ΔU is negative. When a system compresses adiabatically, W is negative (work is done on the system) so ΔU is positive. Adiabatic processes can occur when the system is well insulated or a very rapid process occurs so that there is not enough time for a significant heat to be transferred (e.g., rapid expansion of a gas; a series of compressions and expansions as a sound wave propagates through air).
- 3. System is thermally insulated from the surrounding. The gas expand from volume V1 to V2 as shown by indicator diagram. The Work done by the gas for an increase in volume dV is PdV
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