So here's a question: when we were filming our caesium in water, we expected it to cause a big explosion, much like the rubidium did. Instead we saw this: a series of small, pulsating explosions as it sank. We shot this three times and it was the same each time. Being curious folk, we're trying to find out why - we have a few ideas, but does anyone know for sure? Please help!

Background info: the caesium was kept in liquid nitrogen before the drop and fell from about a metre. The water is at room temperature and contains phenolphthalein.

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