It gets boiled and turns into high temperature steam from the high combustion chamber temperature in the jet engine. There are actually some very interesting videos of jet engine manufacturers testing this at the factory by spraying huge amounts of water into a running engine. The fire in the jet engine is too strong to get extinguished by the water. In fact the expanding steam might help generate thrust in the engine. When the steam is exhausted out the back of the jet engine it will cool down in the ambient air and eventually condense back into water droplets.
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