Smelting

Smelting (or Melting, Baking, Cooking, Burning) is the way you smelt or heat items in Minecraft. The furnace, when right-clicked, has its own menu where heating operations can be done. It consists of one field for the object that will be heated, one field for the fuel and one field for the output object. Each heating operation takes 9.25 seconds. Smelting will work when the smelting menu is closed, as long as there are still objects to heat and there is enough fuel. The fire icon diminishes to represent the fuel burn time. When the fire icon diminishes fully, another fuel item is consumed and the flames are replenished. If all objects are heated, the furnace will stop using additional fuel. If there is no fuel left, the furnace will become inactive. If a heating process was running, it will be cancelled and must be redone.

Ores and materials
{| class="sortable wikitable" ! width="75" | Name ! width="150" | Ingredients ! class="unsortable" width="216" | Input » Output ! class="unsortable" width="390" | Description !Iron Ingot !Gold Ingot !Glass !Stone !Clay Brick
 * -align="center"
 * align="center"| Iron Ore + Fuel
 * Used to craft various items.
 * Used to craft various items.
 * align="center"| Gold Ore + Fuel
 * Used to craft various items.
 * Used to craft various items.
 * align="center"| Sand + Fuel
 * Used to make transparent structures, like windows. Also used to craft Glass Panes and Glass Bottles.
 * Used to make transparent structures, like windows. Also used to craft Glass Panes and Glass Bottles.
 * align="center"| Cobblestone + Fuel
 * Used as a building material, also used for crafting Stone Brick blocks and Redstone Repeaters.
 * Used as a building material, also used for crafting Stone Brick blocks and Redstone Repeaters.
 * align="center"| Clay + Fuel
 * Used to make Brick (Block).
 * Used to make Brick (Block).

Fuel efficiency
Each operation costs 200 units of heat.

History
Before the furnace appeared, smelting was accomplished by creating a fire and dropping the ore into it.

Trivia

 * If you sleep in a bed while a furnace is smelting, the furnace will smelt as if no time has passed. The reason for this is because when you sleep in a bed, no time actually goes by, but instead the game sets the time of day to morning.
 * Burning Wood with Wooden Planks to make Charcoal is over 5 times more efficient than using the wood itself as fuel. It is just over $1 1⁄4$ times more efficient than using planks.