Attention will be drawn to three aspects of surface modelling : (i) delineation of the (scale-dependent) geometrical boundary of a body via molecular considerations, (ii) identification of the highly inhomogeneous interfacial region between a body and its exterior, and its modelling as a bidimensional continuum involving interfacial excess quantities, and (iii) presentation of an example involving thermal expansion which highlights the importance of surface effects for small-scale bodies.
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