20 micrometres
20 µmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 20 micrometres?
Up close
20 µm
20 micrometres
The quantity is exact as entered.
20 µmLength
0 - shared origin
Pollen grain
A pollen grain carries the male reproductive cells of a seed-producing plant.
30 µmCharacteristic size
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
The characteristic size of a pollen grain is about 1.5 times 20 micrometres.
Measurements, assumptions & sources +
20 micrometres
Length: 20 µm; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Pollen grain
Characteristic size: 30 µm; representative.
A chosen 30 µm pollen grain. Plant species produce very different grains.
University of Utah — Cell size and scale
The marked characteristic size is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 20 micrometres with the characteristic size of a pollen grain. The notes below explain how each value was chosen.
Pollen grain
30 µmCharacteristic size · representative
A chosen 30 µm pollen grain. Plant species produce very different grains.
- Comparing
- Length ↔ Characteristic size
- Relative size
- The characteristic size of a pollen grain is about 1.5 times 20 micrometres. The characteristic size of a pollen grain is approximately 50% greater than 20 micrometres.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The characteristic size of a pollen grain: This is a representative comparison value; individual specimens or conditions can vary.
This comparison follows the selected length only; other dimensions may differ.
2 × 10⁻⁵ mmetres
6.5617 × 10⁻⁵ ftfeet
1.2427 × 10⁻⁸ mimiles
1.3369 × 10⁻¹⁶ AUastronomical units
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