Charts / Glossary
Bubble
A chart word, with the charts that use it.
Definition
A bubble is a circle whose area carries a value. Bubbles show rough size well, but exact differences are hard to read, so they suit a quick view of many items.
Updated Nov 2, 2026
- 01Bubble sizeThe bubble's area is its value.
- 02Bubble colourA second signal, such as up or down.
Where you see it
035 · Packed bubblesPart of a whole · Crypto data
Common mistakes
Sizing by diameter
Doubling the width quadruples the area and overstates the value. Size by area.
Bubbles for close values
Similar sizes are hard to tell apart. Use bars when the gaps matter.
Questions
Why size bubbles by area?
People read the area, so an area that doubles reads as a value that doubles.
How many bubbles fit?
Dozens, as long as the big ones carry labels and the small ones can stay unlabelled.
Every chart word, A to Z.
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