2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/224379A microwave experiment has been realized to measure the phase difference of the oscillating electric field at two points inside the cavity. The technique has been applied to a dissipative resonator which exhibits a singularity -- called exceptional point -- in its eigenvalue and eigenvector spectrum. At the singularity, two modes coalesce with a phase difference of $π/2 .$ We conclude that the state excited at the singularity has a definitiv chirality.RevTex 4, 5 figuresChaotic Dynamicstext