BET Surface Area & VSSA Nanomaterial Classifier

This is the 2D counterpart to the 3D BET/VSSA scene, computing the identical gas-adsorption physics through three analytic plots instead of a rendered particle bed: a cross-section of a single representative particle with an adsorbed-N₂ dot ring that fills in as monolayer coverage θ climbs, a BET isotherm curve you can scrub or auto-sweep through the standard 0.05–0.35 relative-pressure range, and a VSSA-vs-diameter chart that traces how volume-specific surface area falls off with particle size against the EU's 60 m²/cm³ regulatory nanomaterial threshold. Tune particle diameter, material density and a roughness/porosity factor and watch the geometric SSA, BET-measured SSA, VSSA and pass/fail classification badge react to the same formulas driving the plots.