Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Clay Bodies and other Ceramics topics.
When moist, clay can be smooth, sticky or slippery, soft, and dense. Its shape can be changed without breaking the material--it can be modeled. We call this most important property of clay plasticity*. A sample of dirt we might find that becomes plastic when we wet it can be considered to be clay or to contain a large percentage of clay. When it is dry, clay can be hard, powdery, and fragile. When fired it is transformed to become very hard, strong, dense, brittle, and impervious to water. Read my full article: Physical properties of clay.