Oxyhydrogen is a mixture of hydrogen (H 2) and oxygen (O 2) gases. This gaseous mixture is used for torches to process refractory materials and was the first [1] gaseous mixture used for welding. Theoretically, a ratio of 2:1 hydrogen:oxygen is enough to achieve maximum efficiency; in practice a ratio 4:1 or 5:1 is needed to avoid an oxidizing The toxic gases released by the burning of fossil fuels are: Carbon dioxide. Carbon monoxide. Nitrogen oxides. Sulphur oxides. These toxic gases are very harmful to all living organisms. The harms caused by these gases are as follows: Carbon dioxide is a greenhouse gas that contributes to global warming. Carbon monoxide on inhalation combines Hydrogen sulfide is a chemical compound with the formula H 2 S.It is a colorless chalcogen-hydride gas, and is poisonous, corrosive, and flammable, with trace amounts in ambient atmosphere having a characteristic foul odor of rotten eggs. The underground mine gas term for foul-smelling hydrogen sulfide-rich gas mixtures is stinkdamp.Swedish chemist Carl Wilhelm Scheele is credited with having Butane/Propane Welding. Butane and propane are similar gases that can be used alone as fuel gases or mixed together. Butane and propane have a lower flame temperature than acetylene, but are less expensive and easier to transport. Propane torches are more frequently used for soldering, bending and heating. Propane requires a different type of The first two shielding gases, argon, and helium, are inert, while the other four—hydrogen, oxygen, carbon dioxide, and nitrogen—are semi-inert. 1. Argon (Ar) Used primarily when welding stainless steel and aluminum, argon also works on carbon steel with arc stability and continuous metal transfer from the weld pool's electrode. Example: fossil fuels, biogas, nuclear energy, etc. Table of Content Types of Fuel Solid Fuel Liquid Fuel Gaseous Fuel Such materials can further be classified into: Renewable source of energy: one which is inexhaustible. Example: Solar energy. Non-renewable source of energy: one which is exhaustible. Example: Fossil Fuels. The two gases used most often for oxyfuel gas cutting are oxygen and acetylene. Oxyfuel gas cutting is a process that relies on the reaction between pure oxygen and a fuel gas (like acetylene) to produce a flame that is high enough in temperature for cutting metal. The fuel gas (acetylene) is first used to heat the metal to its ignition 7PWCgtm.

name two fuel gases