Used and loved by millions
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
diameter of mm
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "diameter of mm" is not correct in written English as it lacks a numerical value before "mm." You can use it when specifying the diameter of an object, but it must include a measurement.
Example: "The diameter of 10 mm is suitable for this application."
⚠ May contain grammatical issues
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
The cables have an elastic modulus of 195 GPa a length of 8.3 m, a diameter of mm, and a capacity of 600 kN.
Human-verified similar examples from authoritative sources
Similar Expressions
59 human-written examples
The nest has a mean internal diameter of 71.5 mm (range 64-78 MarinMarin 2011).
Academia
The length of the tube is 110 mm with diameter of 35 mm.
Science & Research
The concrete samples were cast into a cylindrical shape with a height of 200 mm and diameter of 100 mm.
Physical characteristics of the collagen sponges: 3 mm height, diameter of 5 mm, average pore size: 100 200 μm.
Science
Crossflow microfiltration study was conducted using an indigenously developed ceramic multichannel element with a diameter of 35 mm, length of 200 mm and channel diameter of 4 mm.
This is an intramedullary device which is 200 mm long with a proximal diameter of 15 mm and a distal diameter of 10 mm.
In this tube, four, five mm long, tubes, with an outer diameter of 0.8 mm and inner diameter of 0.5 mm, were inserted.
In the former construct, the outer tube was nine mm long and with an outer diameter of three mm and inner diameter of two mm.
The PET film was formed into an annulus, with an outer diameter of 24 mm, inner diameter of 20 mm and thickness of 0.06 mm.
Science
One is with a diameter of 22 mm and height of 30 mm, the other is with a diameter of 48 mm and height of 60 mm.
Expert writing Tips
Best practice
Always include a numerical value before "mm" when specifying a measurement to avoid grammatical errors and ensure clarity.
Common error
Avoid using "diameter of mm" without a specific numerical value. This omission creates a grammatically incomplete phrase. Provide the exact measurement to maintain accuracy.
Source & Trust
84%
Authority and reliability
2.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "diameter of mm" attempts to specify a dimension. However, it fails to function correctly because it omits the numerical value. Ludwig AI flags this as incorrect, highlighting that a numerical value must precede the "mm" to denote a specific measurement.
Frequent in
Science
100%
Less common in
News & Media
0%
Formal & Business
0%
Academia
0%
Ludwig's WRAP-UP
The phrase "diameter of mm" is grammatically incorrect and lacks clarity because it does not include a numerical value. Ludwig AI indicates that this omission constitutes an error. When specifying dimensions in millimeters, ensure that a numerical value precedes the "mm" to provide a complete and accurate measurement. Consider using alternative phrases like "diameter in millimeters" or "diameter of [number] mm" to avoid this error and improve the precision of your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
diameter of [number] mm
Completes the phrase by adding a numerical value before the unit of measurement.
diameter of [number] millimeters
Uses the full word "millimeters" instead of the abbreviation "mm".
with a diameter of [number] mm
Adds a descriptive start to the sentence.
having a diameter of [number] mm
Alternative to "with a diameter of", rephrasing the opening of the sentence.
diameter in millimeters
Specifies the unit of measurement for the diameter, providing clarity.
diameter measurement in millimeters
Emphasizes that a measurement was taken and is reported in millimeters.
dimension in mm
Broader term that encompasses any dimension, not just diameter, specified in millimeters.
dimensions in millimeters
Specifies multiple measurements in the metric unit of millimeters.
size in mm
Similar to dimension, but generally refers to overall extent.
measurement of [number] mm
A more general phrase to refer to any dimension.
FAQs
How should I correctly use "diameter of mm" in a sentence?
The phrase "diameter of mm" is incomplete without a numerical value. A correct usage would be "diameter of 10 mm" or "the diameter in mm is 10".
What is a more appropriate way to specify a diameter in millimeters?
Instead of "diameter of mm", use phrases like "diameter in millimeters", "diameter of [number] mm", or "size in mm".
What is the difference between "diameter of mm" and "diameter in millimeters"?
"Diameter of mm" is grammatically incorrect as it lacks a numerical value. "Diameter in millimeters" is the correct way to specify that the measurement is in millimeters.
Is "diameter of mm" ever acceptable in technical writing?
No, "diameter of mm" is not acceptable in technical writing due to its lack of precision and grammatical incompleteness. Always provide a numerical value for clarity.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
2.5/5
Expert rating
Real-world application tested