provides almost 100% oxidation during cutting so leaving almost no molten steel in the slag so preventing "sticking" together cut material. Operating cost for a gasoline torch is typically 75-90% less than using propane or Acetylene. The gasoline is fed either from a non-pressurised tank with the fuel being drawn into the torch by a venturi action created by the pressurised oxygen flow OR fuel is fed from a pressurised tank (whose pressure can be hand-pumped or fed from a gas cylinder). Another low cost approach commonly used by jewelry makers in Asia is using air bubbled through a gasoline container by a foot-operated air pump, and burning the fuel-air mixture in a specialized welding torch. Diesel Diesel is a new option in the liquid fuel cutting torch market. The DAVCO DIESEL BOSS diesel torches claim several advantages over gaseous fuels and gasoline. Firstly, diesel is inherently safer and more powerful than gasoline or gaseous fuel such as Acetylene and Propane. Diesel cutting will cut thicker steel faster and cheaper than acetylene or propane. Additionally the liquid fuel vapour is about 5x the density of a gaseous fuel providing much greater "punch". A high velocity cutting flame is produced by the huge volume expansion while the liquid transitions to a vapour so the cutting flame will easily cut across voids (air space between plates). Cuts through paint, dirt, rust and other contaminating surface materials coating old steel. This system provides almost 100% oxidation during cutting so leaving almost no molten steel in the slag so preventing "sticking" together cut material. Operating cost for a diesel torch is typically 75-90% less than using propane or acetylene. Growing use in the demolition or scrap industries Hydrogen Hydrogen has a clean flame and is good for use on aluminium. It can be used at a higher pressure than acetylene and is therefore useful for underwater welding and cutting. It is a good type of flame to use when heating large amounts of material. The flame temperature is high, about 2,000 °C for hydrogen gas in air at atmospheric pressure, and up to 2800 °C when pre-mixed in a 2:1 ratio with pure oxygen (oxyhydrogen). Hydrogen is not used for welding steels and other ferrous materials, because it causes hydrogen embrittlement. For some oxyhydrogen torches the oxygen and hydrogen are produced by electrolysis of water in an apparatus which is connected directly to the