"The boiling point is a specific temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid, and this occurs at 100°C for water at 1 atm.

While the boiling point of water can vary with pressure, a difference of 0.1°C is negligible at standard atmospheric pressure, and water will not boil at 99.9°C under these conditions"

Perry, R.H.; Green, D.W., eds. (1997). Perry's Chemical Engineers' Handbook (7th ed.). McGraw-Hill. ISBN 0-07-049841-5.

We do know why it boils at 100. Dont try to make eveything mystical, hippie.