So here's an empty bag of chips that was lying on a table, and we're going to turn that  bag of chips into a microphone by filming it with a video camera and analyzing the tiny motions that sound waves create in it.
Esta es una bolsa vacía  de papas sobre una mesa y convertiremos esta bolsa  de papas en un micrófono filmándola con una cámara de video y analizando los leves movimientos  que las ondas sonoras hacen.