<span>In science, computing, and engineering, a black box is a device, system or object which can be viewed in terms of its inputs and outputs without any knowledge of its internal workings. Its implementation is "opaque" (black)</span>
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It must not contain protein.
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solids have definite shape and volume. liquid have definite volume but not definite shape. gases do not have definite volume as well as definite shape.
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Presence of unlimited number of elements in the periodic table The inability of atoms to align perfectly with other atoms The ability of all elements to react with every other element All elements being equally reactive.
