lunes, 11 de junio de 2007

Agua en llamas

Si introducimos una bengala en un recipiente con agua, se apaga. Pero, si juntamos unas cuantas bengalas (3 ó 4) y las unimos con un trozo de celo podemos conseguir que continúen quemándose en el interior del agua durante un instante, haciendo que éste burbujee intensamente.
Si utilizamos sólo una bengala el agua la enfría rápidamente y la apaga. Al utilizar varias bengalas se alcanzan temperaturas superiores y el agua no es capaz de enfriarlas lo suficientemente rápido.
El hierro y el magnesio que componen la bengala (son los que producen las chispas) rompen la molécula de agua en hidrógeno y oxígeno. El hidrógeno cuando alcanza la superficie puede quemarse y producir una llama como se aprecia en el vídeo.

El recipiente tiene que ser capaz de soportar altas temperaturas, el vidrio normal podría estallar.

37 comentarios:

Antonio Azuaga dijo...

No tengo bengalas en casa, pero lo que me ha venido a la memoria con la estética del título, y con el vídeo después, es el verso aquel de Quevedo “…nadar sabe mi llama la agua fría…” Se podría decir que también es “químicamente” bello.

Antonio Rodríguez dijo...

Dos días a oscuras, ¿ha pasado algo?

Antonio Azuaga dijo...

Quousque tandem abutere, ... , patientia nostra?

Lola dijo...

Nada más lejos de mi intención (aunque se que tu paciencia es muy,muy grande), a ver si un día de estos retomo el hilo...
pero ya sabes: notas de finales, recuperaciones in extremis, examen de septiembre... volveré, paciencia.

Daniela dijo...

me puedes mandar (si tuviera) alguna variante. me gusto mucho y quisiera reproducirlo.

gracias

javier dijo...

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