To tell one type of matter in objects from another you can measure their properties. The amount of matter in an object is its mass. The amount of space it takes up is its volume. If one material is less dense than another it will float on top of it. Materials that conduct heat allow it to flow through readily. Pots are made of metal since it lets heat pass through. However, the handles are made of wood or ceramic so your hands don’t get burned. These materials insulate against the passage of heat.