1It has a definite shape and a definite volume2It has a definite shape and no definite volume3It has no definite shape and a definite volume4It has no definite shape and no definite volume
To be honest, I would be surprised if continuous belt is used for the high temp firing but 800C (1472F) is not all that hot - ceramics are fired at more like 2000F In any case if they exist, to fire ceramics the material on which the ceramics are moved has to be ceramic, so fire brick surfaces as tiles would be mounted on standoffs from steel conveyor mechanisms which are continuously cooled to keep them within the range of high temperature lubricants - the tiles being cleared of stock on the exit and carried back to the start like steps on an escalatorThe overlap of the tiles with the fixed structure keeps heat confined and hot gases from attacking the supporting metal.
Unless you want to start talking about Quantum level effects, the answer is 1, the cylinder has a definate shape and thus a definate volumeAstrobuf
