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.
No, Salt is a mineral composed of Na and Cl ions. A grains is usually a single seed of a cereal. A grain of salt, may mean a single small piece of salt - and taken with a graâ¦in of salt is a figure of speech meaning to be skeptical.