Absolute Zero of Temperature – temperature at which a gas would exert no pressure Absorbed Dose (D) – total energy absorbed per unit mass of tissue Acceleration (a) – rate of change of velocity Accuracy – An indication of how close a measurement is to the accepted value  (a measure of correctness). Acoustic Impedance...

A relational database is a collection of data items with pre-defined relationships between them. These items are organized as a set of tables with columns and rows. Tables are used to hold information about the objects to be represented in the database. Each column in a table holds a certain...

WRITTEN BY Michi Trota Former Content Development & Growth Manager, Encyclopædia Britannica. Nerd and geek have similar etymologies, with neither originally having much positive association. According to Benjamin Nugent, author of American Nerd: The Story of My People, the word nerd first appeared in the Dr. Seuss book If I...