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Sodium does not react easily with oxygen at a room temperature so it has to be heated up a little for the reaction to start.

Since air is mostly oxygen once the reaction starts it gets pretty...

This science video contains:
explosion, heat, burning, reaction, fire, air, oxygen, sodium

When potassium is heated is starts reacting with oxygen. Since air is mostly oxygen, the reaction happens pretty quickly and it starts burning.

This science video contains:
heat, burning, reaction, fire, air, oxygen, potassium

A small amount of lithium is heated and it reacts very quickly with oxygen creating a burst.

This video was created by University of Oxford.

This science video contains:
burning, lithium, reaction, fire, air, oxygen