Why is it important to blow out the flame before the methanol is completely consumed?

Burying all of the methanol results in a hotter temperature so because flaming is attempting to ignite the dried salts.

That's because as the methanol is eaten to the finish, the flame approaches the dry salts and attempts to ignite them.

It is therefore critical to extinguish the flame even before methanol is entirely consumed.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.