What is the approximate specific gravity of coal?

The specific gravity of coal typically ranges from about 1.1 to 1.5, depending on the type and grade of the coal. Therefore, the choice that approximates the correct range is appropriate. Specific gravity is a measure of how dense a substance is compared to water, which has a specific gravity of 1. When considering the composition and types of coal, a specific gravity of about 1.30 reflects a common average for many coal varieties, indicating that coal is denser than water but varies markedly among different coals. This is important in mining and combustion processes, as the specific gravity affects both the handling and burning characteristics of the coal.