[euroderf]

> Sodium is actually more reactive than lithium and explodes on contact with water.

Isn't the idea that it quickly dissociates water, and the hydrogen and oxygen bubble up ("explosively"?) and are easily ignited ?

[SigmundA]

So quickly that the dissociation causes the ignition, this is colloquially called an "explosion" : https://www.youtube.com/watch?v=5UsRiPOFLjk