The document lists various fuels and their respective combustible values in MJ/kg and Kcal/kg. Natural gas has the highest combustible value at 53,612 MJ/kg and 8,000 Kcal/kg, while coal has the lowest at 16,740 MJ/kg and no Kcal/kg listed. The document provides a comparison of energy densities for different common fuels.

1. combustibleMj/kgKcal/kgGas natural53,612800acetileno48,5511600PropanoGasolinabutano46,011000gasoil42,710200fueloil40,29600antracita34,78300coque32,67800Gas de alumbrado29,37000Alcohol de 95°28,26740lignito20,04800tuba19.74700hulla16,74000<br />