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Volume 15-Change is Coming!
1ChemMedChem, co-owned by ChemPubSoc Europe, Wiley-VCH, Boschstrasse 12, 69469, Weinheim, Germany.
Chemmedchem
|January 14, 2020
Abstract:
2020 Vision! ChemMedChem Editor David Peralta looks back at the journal's activities in 2019, as well as upcoming Special Collections, features, and developments for ChemPubSoc Europe in 2020. He also introduces the journal's new Editorial and International Advisory Board members.
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01:17Work Done During Volume Change
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In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
Consider a gas confined to a cylinder fitted with a movable piston at one end. If the gas expands from volume V1 to volume V2, it exerts a force on the piston, such that the piston moves by a distance dr.
The work done by the gas on the piston can be expressed as
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Free expansion of a gas is an adiabatic process. However, there are few differences between free expansion and adiabatic expansion. During free expansion, no work is done, and there is no change in internal energy. But, for an adiabatic expansion, work is done, and there is a change in internal energy. During an adiabatic process, the relation between the pressure and volume is obtained from the condition for the adiabatic process, that is,
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