Definition
A chart that displays numerical values as rectangular bars, where the length of each bar is proportional to the quantity it represents. Bar graphs are used to compare values across different categories or to show how a single quantity changes over discrete intervals.
Plain English
A picture made of rectangles, where each rectangle's length shows how big a number is. Longer bar means bigger number.
Context Anchor
Seen on some aircraft displays, engine monitors, fuel displays, and in training charts that compare values visually.
Derivation
From 'bar' (a long rectangular shape) and 'graph' (from Greek 'graphein', meaning 'to write or draw'). The name simply describes what it is: a drawing made of bars.
Why Pilots Care
Gives an immediate visual comparison of multiple values without needing to read and interpret numbers.
Analogy
It is like the battery symbol on a phone: more filled-in bars mean more of the thing being measured, and fewer bars mean less.
Intuition Check
Do not read “bar” here as a unit of pressure or a physical metal bar. In this term, a bar is the rectangular shape used to show the amount.
Example Sentence 1
The maintenance technician used a bar graph to compare engine cylinder compression readings across all six cylinders.
Example Sentence 2
The performance section of the handbook included a bar graph showing distances at various weights.