Which fuel solid of the following has the lowest and highest calorific value?

Among common solid fuels, peat generally has the lowest calorific value, typically ranging from 3,000 to 5,000 kcal/kg. In contrast, anthracite coal boasts the highest calorific value, often exceeding 7,000 kcal/kg. Thus, peat is the least energy-dense, while anthracite is the most.