What is resonance ? The principle of resonance is what makes, for example, that a glass vessel breaks when some acoustic vibration around it coincides with any of the normal or proper modes of vibration of the glass, so that if the volume (intensity of the sound) is high enough, the glass will absorb that more energy, its atoms will have more kinetic energy that is amplified by this resonant condition, until the glass breaks (loses its shape, unable to withstand so much internal energy amplified