Explain the "No Change Over Time" Characteristic of a Primary

question 57

Essay

Explain the "no change over time" characteristic of a primary key.

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Definitions:

Electromagnetic Energy

The energy propagated through space or matter as electromagnetic waves or photons, involved in phenomena such as light, radio waves, and X-rays.

Mechanical Energy

The sum of potential and kinetic energy in a physical system, which enables it to do work.

Chemical Energy

A form of potential energy stored in chemical bonds between atoms and molecules.

Just Noticeable Difference (JND)

The smallest difference in stimulation that a person can detect 50% of the time; a measure of sensory sensitivity.