Reply to comment on 'Surface thermodynamics and surface stress for deformable bodies'

The above comment and a previous letter by the same author reveal a great misunderstanding of what Eulerian and Lagrangian quantities are, and a confusion between the deformation of an element of a surface and the creation of a new element of a surface. Surface thermodynamics is complex because the...

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Veröffentlicht in:Journal of physics. Condensed matter 2010-10, Vol.22 (42)
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description The above comment and a previous letter by the same author reveal a great misunderstanding of what Eulerian and Lagrangian quantities are, and a confusion between the deformation of an element of a surface and the creation of a new element of a surface. Surface thermodynamics is complex because the surface quantities are not 'intuitive' (as surface excesses on some dividing surface) and the thermodynamic variables of the state of a surface are a priori completely unknown. This is why we introduced a new concept ('ideal transformation') and presented detailed proof, leading to the determination of the 'local' thermodynamic variables of the state of the surface, the exact expression of the work of deformation of the surface, and the definition of surface stress, for any deformable body (Olives 2010 J. Phys.: Condens. Matter 22 085005). These results are not obvious (despite their similarity with some expressions in volume thermodynamics). We explicitly write the Eulerian forms of (i) the relation between the surface grand potential per unit area, the surface stress and the surface strain, showing its exact equivalence with the Lagrangian form, and (ii) the variation of the surface energy due to both the deformation of an element of the surface and the creation of a new element of the surface.
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We explicitly write the Eulerian forms of (i) the relation between the surface grand potential per unit area, the surface stress and the surface strain, showing its exact equivalence with the Lagrangian form, and (ii) the variation of the surface energy due to both the deformation of an element of the surface and the creation of a new element of the surface.</description><identifier>ISSN: 0953-8984</identifier><identifier>EISSN: 1361-648X</identifier><identifier>DOI: 10.1088/0953-8984/22/42/428002</identifier><language>eng</language><publisher>IOP Publishing [1989-....]</publisher><subject>Condensed Matter ; Other ; Physics</subject><ispartof>Journal of physics. 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title Reply to comment on 'Surface thermodynamics and surface stress for deformable bodies'
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