<P> The term "propane torch" may refer to anything from a small consumer - grade hand - held burner with a small attached tank or an industrial torch which has separately located fuel and pure oxygen tanks to feed the flame with 100% oxygen in return for much higher temperatures, as long as it uses propane . A similar gas, known as MAPP - gas or MAP - PRO, is similar to propane, but burns hotter . It is usually found in a yellow canister, as opposed to propane's blue, black, or green . Propane is often the fuel of choice due to its low price, ease of storage and availability . Alternative fuel gases can be harder to store and more dangerous for the user . 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 . </P> <P> 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 carburettor works . The fuel and air mix sufficiently, but often imperfectly, in the burner's tube before the flame front is reached . The flame also receives some further oxygen from the air surrounding it . </P> <P> Oxygen - fed torches use the high pressure of the stored oxygen to push the oxygen into a common tube with the fuel . An air - only torch will burn at around 1,995 ° C (3,623 ° F), less if heat loss to the surroundings is taken into account . Oxygen - fed torches can be much hotter at up to 2,820 ° C (5,110 ° F), depending on the fuel - oxygen ratio . These are the theoretical maximum temperatures, in reality they will always be less due to incomplete combustion, heat loss etc . </P> <P> Propane torches are frequently employed to solder copper water pipes . They can also be used for some low temperature welding applications, as well as for brazing dissimilar metals together . </P>

What is the temperature of a propane torch
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