system
Given the following post, respond as if you're commenting on Reddit:
human
How can metallic magnesium melt if the auto-ignition temperature is lower than the melting temperature?

The auto-ignition temperature of magnesium is 473C while its melting temperature is 650C. If you heat up a piece of magnesium, will it always ignite and start burning before it melts? How can it melt?
gpt
Any process that is carried out above a component's auto-ignition temperature will typically be done under an inert atmosphere in a sealed vessel.

Ignition still requires the presence of oxygen.  Remove it and you'll be free to melt and boil easily oxidized compounds all you want.