Models and Charts for Estimation of Solutions of Sulphuric Acid as Generator of Constant Relative Humidity and Corresponding Water Activity Values in an Enclosed Constant Temperature Environment

Abstract

This paper seeks to comprehensively provide quantitative models and system of charts developed by computerized regression and interpolation  for using solution of sulphuric acid as a sole and cost-efficient desiccant, which at different concentrations (from 0 to 100%) and temperatures (from 0 to 100°C), can be employed to generate and maintain reliable relative humidity (R.H.%) and corresponding water activity (a_w) values to achieve any desired experimental test- environment within a sealed hygrostatic container in a constant temperature incubator. The models and charts developed were successfully verified and validated. Therefore, the models and charts are rationally good for estimating solutions of sulphuric acid (in % concentration) for generating desired constant relative humidity (R.H.%) and corresponding water activity (a_w) environments.