Why is water seeping out of the slit when cutting the steel plate

In the process of steel plate cutting, water will seep out of the cutting joint. What's the reason?

The problem of water seepage in cutting seam of steel plate starts from the principle of steel plate cutting technology. Steel plate cutting is to heat the steel plate, when it reaches the liquid state, it can make the steel plate cut. In this process, the heated flame is produced by acetylene combustion. Such a combustion process is actually an oxidation process, so there will be a lot of heat, the final result is to produce water vapor.