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The phrase "are liquid" is correct and usable in written English.
It can be used to describe a state of matter or to indicate that something is in a fluid form.
Example: "The substances in this experiment are liquid at room temperature."
Alternatives: "are in liquid form" or "exist as liquids".
Dictionary
Exact(58)
Scene changes are liquid; the images are simple.
At sufficiently high temperatures all the clusters are liquid.
And that her eyes, no longer downcast in maidenly fashion, are liquid and intense.
The beat is driving, constant, even ferocious, but Boseman's movements are liquid.
"The constituent parts are liquid oxygen and liquid hydrogen – that's rocket fuel.
From there, further chemical processing yields hydrogen and carbon combinations that are liquid at room temperature.
The main imports are liquid fuels, fertilizers, wheat, heavy equipment, textiles, and beverages.
For all that, the big banks are liquid and soundly capitalized.
Amalgams are crystalline in structure, except for those with a high mercury content, which are liquid.
Beneath the solos are liquid string harmonies, anguished scurrying and major outbursts suitable to the subject matter.
Similar(1)
Commonly applied are liquid-liquid extraction [LLE] and solid-phase extraction [SPE].
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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