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Discover LudwigThe phrase "an quantity" is not correct in written English.
It should be "a quantity" because "quantity" begins with a consonant sound.
Example: "We need to measure a quantity of water for the experiment."
Alternatives: "a measure" or "an amount".
Exact(1)
Disease control theory focuses on an quantity called the reproductive ratio, designated here as R 0 at the start of the outbreak and, if changing over time, Rt at time t.
Similar(59)
A quantity is a scalar.
A quality value belongs to a "categorical" class, and a quantity contains a quantitative quantity and a qualitative quantity.
The physical dimension of a quantity is an abstraction of a quantity ignoring magnitude, sign and direction aspects[ 13].
"Colour gives a quantity to an object which is illusionistic," says Kapoor.
It's both a quality and a quantity issue.
Get a Job as a Quantity Surveyor.
It is a quality, not a quantity.
It is a symbol denoting a quantity of two.
A number is just a quantity.
A quantity of natural gas has a certain price.
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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