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Discover Ludwig"fluid intelligence" is a correct and usable term in written English.
You can use it in a sentence when referring to intelligence which can be applied in different contexts, or which can be varied and changed in order to adjust to different situations. For example: "John demonstrated a remarkable level of fluid intelligence, able to tackle challenges from multiple angles with ease."
Dictionary
fluid intelligence
noun
The capacity to think logically and solve problems in novel situations, independent of acquired knowledge.
Exact(59)
It is crystallized intelligence, not fluid intelligence.
"Crystallized" and "fluid" intelligence are different, both behaviorally and biologically.
Those abilities, called fluid intelligence, peak in the 20s.
"Its role is to support general fluid intelligence," Fedorenko said.
Fluid intelligence is more your ability to solve novel problems.
Do I think you can change fluid intelligence?
"Fluid intelligence is not culturally derived," he continues.
tests — which gauge both "fluid" intelligence (abstract reasoning skills) and "crystallized" intelligence (knowledge) — measure something real.
First they measured the fluid intelligence of four groups of volunteers using standard tests.
So the researchers reasoned that improving it might lead to improvements in fluid intelligence.
Similar(1)
While participants pondered these scenarios, they performed common fluid-intelligence and cognition tests.
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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