Heat dissipated from an engine in operation can cause hot spots on i
Heat dissipated from an engine in operation can cause hot spots on its surface. If the outer surface of an engine is situated in a place where oil leakage is possible then when the leaked oil comes in contact with hot spots above the oils auto ignition temperature it can ignite spontaneously. Consider an engine outer surface that can be approximated as a blackbody. To prevent fire hazard in the event of oil leak on the engine surface the surface temperature of the engine should be kept below 180C. A radiometer is placed normal to and at a distance of 1 m from the engine surface to monitor the surface temperature. The radiometer receives radiation from a target area of 1 cm2 of the engine surface. If the radiometer detects an irradiation of 0.1 W/m2 would there be any risk of fire hazard?