Contributions to the Study of Coal: A Proposed Simplification of the Parr Unit Coal Formula, Ash-to-Mineral Matter Correction in Coal Analyses, Unit . Applied to Illinois Coals (Classic Reprint)

Simplify coal calorific values with a practical approach that saves time and improves consistency. This collection presents a clarified method for calculating unit coal calorific values without replacing established formulas. It includes a proposed simplification of the Parr unit coal formula, ash-to-mineral matter corrections, and the idea of using unit coal as a basis for standardization in Illinois coals. Ideal for professionals in coal analysis, thermochemistry, and industrial testing.

Blend theory with practice through a new factor that combines key corrections into one adjustable value. The book explains how sulfur, ash, and hydration influence results and shows how to apply the simplified method to real samples. It also covers graphical methods for estimating pure coal calorific value and demonstrates standardization approaches that rely on unit coal values.

• Learn a practical modification of the Parr unit coal formula that remains accurate within experimental error.


• Understand how ash, sulfur, and mineral hydration affect calorific calculations.


• See how unit coal values can support coal standardization in a local or regional setting.


• Explore a graphical approach to determining pure coal calorific values and compare methods.

Ideal for readers working with coal analysis, calorimetry, and standardization in laboratories and industry.