Please take the time to watch this informative educational video clip.
From a militiary friend:
When I was stationed in Charleston Navy base at the Fire Fighting Training school we would demonstrate this with a deep fat fryer set on the fire field. The instructor would don a fire suit and using an 8 oz cup at the end of a 10 foot pole toss water onto the grease fire.
The results got the attention of the students. The water, being heavier than the oil, sinks to the bottom where it instantly becomes superheated. The explosive force of the steam ...