A microkernel implements all drivers as user-space programs, and implements core features like IPC in the kernel itself. A monolithic kernel, however, implements the drivers as a part of the kernel...
The composition of the porcelain clays is usually more malleable than the clays used for china ware. This allows for forming of more intricate and detailed shapes. China ware differs from porcelain not only in color shade, but also in the way it is fired. Where Porcelain becomes vitrified during the second firing (second firing is hotter than first firing), china ware is vitrified during a single firing. With the china, there is only a single firing.
Porcelain is also a champ at shrugging off water. It may sound simple, but a porous material will allow liquid and bacteria in, so being impervious to both is important in a structure that's main job is to deal with waste. The key to keeping water out is in the porcelain's glaze. After the toilet is coated, it's fired in a kiln. Unlike, say, grout in a shower, which takes on both water and bacteria, the glaze stops bacteria at the toilet's surface.