Por qué al golpear la boca de una botella de cerveza se rompe el fondo si está rellena con agua

Toca Comer. Por qué al golpear la boca de una botella de cerveza se rompe el fondo si está rellena con agua. Marisol Collazos Soto, Rafael Barzanallana

Un popular truco de fiestas cafres de jóvenes universitarios es romper el fondo de una botella tras golpear con fuerza en su parte superior. El truco no funciona si la botella está vacía o si está rellena con cerveza (o cualquier otro líquido carbonatado). Sin embargo, funciona a la perfección si la botella de cerveza está rellena con agua. ¿Por qué funciona este truco con agua y no con cerveza? La razón la ilustra muy bien este vídeo. El golpe en la boca de la botella provoca la formación por cavitación de pequeñas burbujas en el fondo del líquido cuyo posterior colapso libera mucha energía y provoca microfracturas en el cristal de la botella causando la rotura del fondo. Sin embargo, si se rellena la botella con cerveza o cualquier líquido carbonatado las burbujas que se forman con el golpe en lugar de colapsar se ponen a crecer, se mueven por el fluido y evitan que la botella se rompa. Para descubrir que el colapso de las burbujas explica este curioso truco, los investigadores han utilizado un acelerómetro colocado en el fondo del a botella, que muestra que la rotura no empieza cuando el impacto del golpe alcanza el fondo, si no un poco más tarde; las cámaras de alta velocidad indican que empieza cuando las burbujas empiezan a colapsar.

Ampliar en: Francis (th)E mule Science’s News

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