What is a kiln?

• A. An oven used for firing ceramics.
• B. A device for polishing metal.
• C. A wooden panel used for painting.
• D. A brush for applying glaze.

Answer: (A)

A kiln is a specialized furnace used to fire ceramics. When clay objects are formed, they still contain moisture and plastic in a way that must change to become hard and durable. Firing in a kiln drives off remaining water, triggers chemical changes in the clay, and, if glaze is present, fuses the glaze to the surface to create a smooth, glassy finish. Kilns reach much higher temperatures than ordinary ovens and provide controlled heat over precise durations, with different types (electric, gas, or wood-fired) chosen for the desired atmosphere and outcome. That is why it is described as an oven used for firing ceramics. The other options refer to tools for polishing metal, preparing a painting surface, or applying glaze by brush, which are not about the firing process.