Propane is bought and stored in a liquid form (LPG), and thus fuel energy can be stored in a relatively small space. Compressed natural gas (CNG), largely methane, is another gas used as fuel, but it cannot be liquefied by compression at normal temperatures, as these are well above its critical temperature.
Anthracite accounts for about 1% of global coal reserves, and is mined in only a few countries around the world. China accounts for the majority of global production; other producers are Russia, Ukraine, North Korea, South Africa, Vietnam, the UK, Australia and the US.he term is applied to those varieties of coal which do not give off tarry or other hydrocarbon vapours when heated below their point of ignition. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame.
The first use of anthracite was by the Gore Brothers in their blacksmith. shop at Wilkes-Barre in 1769. The coal industry grew slowly but steadily from those early days, match-. ing the growth of American industry. The great expansion in coal mining. took place following the Civil War, when coal powered the vast industrial. revolution of the late nineteenth and early twentieth centuries.