La moneda saltarina

Cuando un gas se calienta, aumenta su volumen. Y cuando se enfría, disminuye.

1.- Si dejas una botella vacía en el congelador de casa (unos 20 minutos), el aire que contiene se enfría, y al enfriarse, se encoge (disminuye su volumen).

2.- Si la sacamos del congelador y le colocamos en la boca una moneda que no pese demasiado (una de 5 céntimos de euro, que mojamos un poquito en agua para que tape mejor), al poco tiempo el aire se hincha (aumenta de volumen) y empuja la moneda, hasta que la hace saltar.

botellaspeq

En el siguiente video podéis ver lo que ocurre (¡¡¡pon el audio al máximo!!!):

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