3) In hardware design, a prototype is a hand-built model that represents a manufactured (easily replicable) product sufficiently for designers to visualize and test the design. The word prototype comes from the Latin words proto, meaning original, and typus, meaning form or model.
In chemistry, a salt is an ionic compound which is made up of two groups of oppositely charged ions. The ion with a positive charge is called a cation, and the one with a negative charge is called an anion.
In chemistry, salts are ionic compounds that are formed from the neutralization reactions of an acid and a base. Salts come in a variety of tastes and colors. Some salts are not safe to eat. What most people call salt is the chemical compound sodium chloride.