Exact(33)
If you have the length of the circle's radius instead of its diameter, you have to double it before you can multiply it by π.
The stiffness of an archwire is a function of its diameter, length and the alloy it is made from.
Yet a cilium's entire operating range of motion is only about half of its diameter".
Astronomers now believe Mercury has indeed shrunk, losing about 14km of its diameter since its formation.
Because the area (and therefore the weight) of a balloon goes up by the square of its diameter and the volume (and therefore the lift) increases by the cube of its diameter, they succeeded handily.
When the virus's environment turns more acidic, the capsid smoothes and swells by about a third of its diameter.
Similar(27)
Defined as the ratio of the circumference of a circle to its diameter, π is one of the weirder numbers going.
Identical 11.5-cm plastic handles were affixed to each rod, preventing the participants from feeling the material the rod was made of or its diameter.
The measurement of the primary tumor consisted of the product of its greatest diameter and its perpendicular diameter.
The model predictions for droplet extinction diameter as a function of its initial diameter are shown to compare favorably with experimental results for methanol burning in air.
In fact, its polar diameter is a mere 64% of its equatorial diameter (the previous record was 85%).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com