Apparatus and instruments for physics, namely microscopes, proprietary constant composition expansion analysis microfluidic chips for reservoir fluids, swelling factor characterization microfluidic chips, minimum miscibility pressure microfluidic chips, diffusion coefficient measurement microfluidic chips, hydraulic fracturing fluid optimization microfluidic chips, t-sensor microfluidic chips, micromodel microfluidic chips, all having multi-well arrays that can be used in chemical analysis, b...