Propane torch

For example, acetylene needs a porous material mixed with acetone in the tank for safety reasons and cannot be used above a certain pressure and withdrawal rate.

Natural gas is a common fuel for household cooking and heating but cannot be stored in liquid form without cryogenic refrigeration.

[2] Small air-only torches normally use the Venturi effect to create a pressure differential which causes air to enter the gas stream through precisely sized inlet holes or intakes, similar to how a car's carburetor works.

The fuel and air mix sufficiently, but imperfectly, in the burner's tube before the flame front is reached.

There are other unbalanced ratios where incomplete combustion products such as carbon monoxide (CO) are formed, such as:[7] An air-fed torch's maximum adiabatic flame temperature is assumed to be around 2,000 °C (3,600 °F).