Sculpture of p-v-T surface Maxwell's 3D Sketch of the lines on Gibbs' thermodynamic surface(8 July 1875) Gibbs'equation of state de=tdn-p du t,absolute temperature p.pressure Scottish engineer James Thomson's 1871 Gibbs'dagram sculptured by thermodynamics surface model,on display at James Clerk Maxwel 1874 the Hunterian Museum and Art Gallery,University of Glasgow Maxwell's thermodynamic surface,at Cambridge University,with 2007 overlay annotation added on by American engineer Ronald Kriz 上游充通大 March 12,2019 8 SHANGHAI JLAO TONG UNIVERSITYMarch 12, 2019 8 Sculpture of p-v-T surface Maxwell's 3D Sketch of the lines on Gibbs’ thermodynamic surface (8 July 1875) Scottish engineer James Thomson's 1871 thermodynamics surface model, on display at the Hunterian Museum and Art Gallery, University of Glasgow Maxwell's thermodynamic surface, at Cambridge University, with 2007 overlay annotation added on by American engineer Ronald Kriz