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La fibra es muy gruesa.

La fibra es muy gruesa.
The fiber is very thick.
From Lesson 460:Impersonal instructions (infinitives)·Spanish (Latin America)

Breakdown of La fibra es muy gruesa.

ser
to be
muy
very
grueso
thick
la fibra
the fiber

Questions & Answers about La fibra es muy gruesa.

Why use es instead of está here?
We use ser (es) because being thick is an inherent physical characteristic of this specific fiber. If we used estar (está), it would imply a temporary state or a recent change from its normal condition (e.g., 'it has become unusually thick').
Why use gruesa instead of espesa for 'thick'?
In Spanish, the word for 'thick' depends on what you are describing. Grueso (and its feminine gruesa) is used for physical objects that have a large width, diameter, or thickness, like a fiber, rope, book, or wall. Espeso, on the other hand, is used for dense liquids, mixtures, or gases, like thick soup or fog.
Does fibra refer to dietary fiber or a material fiber?
Just like in English, fibra can mean both dietary fiber and material fibers (like thread, muscle, or optical fiber). However, because we are describing its physical dimensions with gruesa, this sentence is almost certainly talking about a material or textile fiber.

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