Basic Terms
Acoustic Terms
Formulae
Principles & Theories
Measurement Units
100

This force acts perpendicularly on a surface

What is force? 
100

Areas of increased density caused by molecular collision

What is compression or condensation? 

100

This is equal to 1/t

What is frequency?
100

Given a constant temperature, increasing the volume of enclosed space decreases the air pressure in that space, and vice versa

What is Boyle's Law?

100

Unit of acoustic frequency

What is Hertz (Hz)? 

200

This is a 3-dimensional space that is occupied

What is volume?

200

Areas of decreased density caused when molecules return to their resting position

What is rarefaction?

200

This is equal to 1/F

What is period?

200

The restoring force of elasticity is proportional to the amount of displacement or deformation undergone by the object

What is Hooke's Law?

200

Unit of acoustic intensity

What is Decibel (dB)?

300

This is the amount of mass per unit volume

What is density?

300

A sound wave with only one frequency, resulting from simple harmonic motion

What is pure tone or sine wave? 
300

This is equal to the speed of sound divided by frequency

What is wavelength?

300

The movement of air through a certain area within a given time period

What is flow?

300

Unit of acoustic loudness

What is Phon?

400

The property of an object to return to its original location/form after being displaced/deformed

What is elasticity or restoring force? 

400

A sound wave consisting of two or more frequencies, where each cycle requires the same amount of time and the amplitude of all cycles is equal

What is complex periodic?

400

This is equal to the speed of sound divided by wavelength

What is frequency?

400

The relative timing of high and low pressure areas in sound waves occupying the same space

What is a phase?  
400

Unit of acoustic pitch

What is Mel?

500

The reason why objects at rest tend to remain at rest and objects in motion tend to remain in motion, unless acted upon by an outside force

What is inertia?

500

A sound wave consisting of multiple frequencies that are not related to each other, where each cycle does not require the same amount of time

What is complex aperiodic? 

500

This is proportional to the square of amplitude

What is intensity?

500

This term describes the constant random pattern of air molecule motion

What is Brownian Motion?

500

Unit comprised of 10 decibels

What is Bel (B)?