NLS-Glossary

The set of characters permitted within a particular bar code symbology type. Not all bar code types can encode the entire ASCII character set.                                                                                                                                                                                                          

A character used to check the integrity of the preceding bar code symbol. A check character is normally found at the end of the data encoded within the bar code.           

One or more extra characters that are appended to a barcode symbol in a type of redundancy check that is used for error detection. Their values are derived by an algorithm from the sum or weighted sum of the other characters in the data stream.

of a system or a substance is the potential energy per atom for doing non pV (non-mechanical) work, for example electrical or magnetic work. It is the change in the chemical potential (or change in Gibbs free energy per atom) that results in non-pV work to be done. For example in a battery, the EMF, V, that is available is the change $∆\mu$. The term chemical potential (potential energy) is used because the work comes about typically through chemical changes.

is a chemical process by which reaction between gaseous reactants results in products that are deposited as solid.                                                                                                   

is a piece (or a volume) of a semiconductor crystal which contains many integrated active and passive components to implement a circuit.