Gunpowder Barrel

About
Gunpowder barrels are a type of primitive explosive that can be crafted using wooden planks and gunpowder blocks. Despite this item being a storage barrel, it cannot be used for storage of gunpowder. Once crafted, it can only be used as an explosive.

Detonation
A gunpowder barrel can be detonated in five ways
 * 1) By direct ignition (flint and steel)
 * 2) Indirect ignition (fire spreading to the barrel)
 * 3) Redstone power
 * 4) Being in the vicinity of another explosion
 * 5) Shot by an arrow with the flame enchantment

Crafting
The recipe for gunpowder barrels is shown:

A gunpowder barrel can be crafted by placing wood planks in slots 1,4,7,3,6, and 9, and gunpowder blocks in slots 2,5, and 8.

Trivia

 * Gunpowder barrels produce an explosive yield of 7 SEUs, equivalent to a wither exploding.
 * Gunpowder barrels are part of the 'poor man's arsenal'