What does this number measure?
An enveloped virus with crown-like surface proteins. Coronaviruses have an RNA genome. Their diameter varies between particles and with the measurement convention; this reference does not represent one identical size for all viruses in this family.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Catalogue order of magnitude; a source is provided, but this measurement has not been individually audited.
Coronavirus: conceptual model of an envelope crowned with spike proteins. Colours and molecular details are not photographic; representative and variable diameter, including spikes.