Acoustic Glossary


Q : Sound and Vibration Definitions, Terms, Units, Measurements ..

Q : Exchange Rate

Quality Factor IEC Definition,

a measure of sharpness of resonance of a system, being 2π times the ratio of the maximum stored energy to the energy dissipated during one cycle

Note : historically, the letter Q was an arbitrarily chosen symbol to designate the ratio of reactance to resistance of a circuit element. The name "quality factor" was introduced later

Quality Factor : Q sharpness of Resonance, another term for Amplification Factor .


International System of Quantities : ISQ IEC Definition,

system of quantities based on the seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity

Note 1 : the International System of Quantities is published in the International Standard ISO/IEC 80000, Quantities and units.
Note 2 : the International System of Units (SI) is based on the ISQ.

Quantity Symbol

Quotient ratio of two numbers or quantities to be divided, for example a measured Sound Pressure to the Reference Sound Pressure.