When you are going to burn magnesium you need to wait a few seconds before it actually starts to burn. To get to this point it needs a certain amount of energy/heat. How much does it need?

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    $\begingroup$ Ummm, it's not a matter of specific amount, just at least a small bit should get very hot and then reaction gets self-sustaining. $\endgroup$ – Mithoron Nov 22 '17 at 15:21

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