20 centimetres
20 cmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 20 centimetres?
Up close
20 cm
20 centimetres
The quantity is exact as entered.
20 cmLength
0 - shared origin
Sea hare
A sea hare is a soft-bodied marine mollusc related to sea slugs, capable of releasing ink when threatened.
20 cmDefined body length
0 - shared origin
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. A ruler represents the selected distance or a measurement not visible in this view.
A little perspective
20 centimetres is approximately equal to the body length of a sea hare.
Measurements, assumptions & sources +
20 centimetres
Length: 20 cm; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Sea hare
Defined body length: 20 cm; defined specimen; range 12 cm–30 cm.
A defined 20 cm Aplysia sea hare measured along the relaxed body. Species, maturity and posture vary greatly; extended oral tentacles are excluded.
Monterey Bay Aquarium — California sea hare
The marked defined body length is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 20 centimetres with the body length of a sea hare. The notes below explain how each value was chosen.
Sea hare
20 cmDefined body length · defined specimen · range 12 cm–30 cm
A defined 20 cm Aplysia sea hare measured along the relaxed body. Species, maturity and posture vary greatly; extended oral tentacles are excluded.
- Comparing
- Length ↔ Defined body length
- Relative size
- 20 centimetres is approximately equal to the body length of a sea hare.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- We use 20 cm for the body length of a sea hare; the recorded range is 12 cm–30 cm.
- The body length of a sea hare: This is an illustrative comparison value, not a claim that every example is the same.
- The recorded ranges overlap, so the ordering can vary even though the central values differ.
This comparison follows the selected length only; other dimensions may differ.
0.2 mmetres
0.65617 ftfeet
0.00012427 mimiles
1.3369 × 10⁻¹² AUastronomical units
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