Which test measures the temperature at which aviation fuel vapors will ignite (the test used to assess flammability)?

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The key idea being tested is understanding how we assess flammability of aviation fuels by finding the temperature at which their vapors can ignite. This is done with a flash point test, which identifies the lowest temperature at which enough fuel vapor is present to briefly ignite when exposed to an ignition source. In practice, the sample is heated in a closed or semi-closed cup and a small flame or spark is applied at intervals; the temperature where a flash is observed is recorded as the flash point. Knowing the flash point helps safety planning for storage and handling, because fuels with lower flash points pose a higher risk of ignition. Other tests look at different properties: water in fuel checks for water contamination, pour point determines the lowest temperature at which the fuel will flow, and viscosity measures how easily it flows. None of those assess the ignition of vapors, so the flash point test is the correct one for gauging flammability.