A material is any substance or mixture of substances that occupy a volume, and has a mass. A substance usually refers to pure compound. Appearance, behavior, name, structure, color, order, composition and any information about a substance are properties of a material. We most likely recognize a material by its appearance, sometimes aided by other senses such as touch, smell, ... Read more

An electric circuit is a closed loop made of conductors and other electrical elements through which electric current can flow. For example, a very simple electrical circuit consists of three elements: a battery, a lamp, and an electrical wire that connects the two. Read more