Questions & Answers about Η πορσελάνη είναι ακριβή.
Η is the feminine singular definite article, so literally it means the.
It matches πορσελάνη, which is a feminine noun:
- η πορσελάνη = the porcelain
In this sentence, though, Greek uses the article even where English often does not.
In Greek, the definite article is often used with general statements and with mass nouns more than it is in English.
So:
- Η πορσελάνη είναι ακριβή.
naturally means - Porcelain is expensive.
Even though it looks literally like The porcelain is expensive, it can still have a generic meaning. Leaving out the article would usually sound less natural in this kind of sentence.