The flash point of a volatile material is the lowest temperature at which vapours of the material will ignite, when given an ignition source. The fire point of a fuel is the lowest temperature at which the vapour of that fuel will continue to burn for at least 5 seconds after ignition by an open flame. At the flash point, a lower temperature, a substance will ignite briefly, but vapour might not be produced at a rate to sustain the fire. Cloud point is the temperature at which one component of a mixture of liquids begins to solidify (or a mixture of liquids starts to become immiscible) on cooling, resulting in visible cloudiness. The pour point of a liquid is the temperature at which it becomes semi solid and loses its flow characteristics.