Final answer:
The flash point is the lowest temperature at which a liquid's vapor may ignite momentarily. It differs from the boiling point, where the vapor pressure equals atmospheric pressure.
Step-by-step explanation:
The term for the lowest temperature at which a liquid produces enough flammable vapor to ignite momentarily is known as the flash point. This is different from the boiling point, which is the temperature at which the vapor pressure of a liquid equals the pressure of the gas above it. At the flash point, the vapor may not necessarily continue to burn; this depends on whether the ambient temperature is high enough to sustain the vapor's ignition in the presence of an ignition source. Gases within a closed container, such as in the provided scenario with the warning on a can, can become hazardous if the temperature increases significantly, leading to an increase in pressure which could cause the container to rupture or explode if not properly stored or disposed of.