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Mass

Just how heavy is 1 microgram?

In your hand

1 µg

Scale
1 microgram

The quantity is exact as entered.

1 × 10⁻⁹ kgMass in kilograms
0 kg
Copepod

A copepod is a tiny aquatic crustacean found in marine and freshwater environments, playing a key role in aquatic food webs.

1 × 10⁻⁸ kgDefined wet mass in kilograms
0 kg

Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.

A little perspective

The wet mass of a copepod is about 10 times 1 microgram.

Measurements, assumptions & sources +

1 microgram

Mass: 1 µg; definition.

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

Copepod

Defined wet mass: 10 µg; defined specimen; range 3 µg–30 µg.

A defined 2 mm adult calanoid copepod specimen with a 10 microgram wet mass. The body span excludes the long antennules; species, life stage and hydration produce wide variation.

Defined examples — our methodology

The marked defined wet mass is calibrated. Unmeasured illustration details are representative.

Measurement details

Why these numbers?

Compare 1 microgram with the wet mass of a copepod. The notes below explain how each value was chosen.

1 microgram

1 µg

Mass · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

Copepod

10 µg

Defined wet mass · defined specimen · range 3 µg–30 µg

A defined 2 mm adult calanoid copepod specimen with a 10 microgram wet mass. The body span excludes the long antennules; species, life stage and hydration produce wide variation.

Comparing
Mass ↔ Defined wet mass
Relative size
The wet mass of a copepod is about 10 times 1 microgram. The wet mass of a copepod is approximately 900% greater than 1 microgram.

How to read the visual

The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.

  • We use 10 µg for the wet mass of a copepod; the recorded range is 3 µg–30 µg.
  • The wet mass of a copepod: This is an illustrative comparison value, not a claim that every example is the same.

Mass is distinct from weight: an object’s mass stays the same as gravity changes.

1 × 10⁻⁹ kgkilograms
2.2046 × 10⁻⁹ lbpounds
1 × 10⁻¹² ttonnes

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