noun🔗ShareRarefacciónA reduction in the density of a material, especially that of a fluid."The sudden rarefaction of air near the explosion caused a sharp drop in pressure that shattered nearby windows. "La repentina rarefacción del aire cerca de la explosión causó una fuerte caída de presión que hizo añicos las ventanas cercanas.physicsmaterialsubstanceChat with AIVocabulary GamePractice Reading