Definition
The amount of three-dimensional space occupied by a substance, object, or enclosed area, or the loudness level of an audio signal in cockpit communications and navigation equipment.
Plain English
How much space something takes up, or how loud a sound is set to play.
Context Anchor
Seen in aviation abbreviations, aircraft system descriptions, maintenance notes, and reports that discuss amounts of air, fuel, oil, or traffic.
Derivation
From the Latin volumen, meaning a roll or scroll. Early books were rolled scrolls, and the word came to describe the size of the rolled-up bundle. From there it expanded to mean the amount of space anything occupies, and later the size or loudness of a sound.
Why Pilots Care
Fuel volume directly determines available range, endurance, and payload limits.
Intuition Check
Do not assume volume means only sound level. Here, VOL usually means an amount or quantity, unless the context is clearly about audio.
Example Sentence 1
She turned up the VOL on the number two radio so she could hear the approach controller over the engine noise.
Example Sentence 2
Performance charts list the baggage compartment volume to help plan cargo loading.