Η ενυδάτωση αλλάζει την ελαστικότητα.

A word-by-word breakdown is:

• Η = the (feminine singular, nominative)
• ενυδάτωση = hydration
• αλλάζει = changes / is changing
• την = the (feminine singular, accusative)
• ελαστικότητα = elasticity

So the structure is basically:

The hydration changes the elasticity.

Because Greek articles change according to case, gender, and number.

In this sentence:

• Η ενυδάτωση is the subject of the sentence, so η is in the nominative
• την ελαστικότητα is the direct object, so την is in the accusative

Both nouns are feminine singular, but they play different roles in the sentence, so the article changes.

A very useful pattern is:

• η = feminine singular nominative
• την = feminine singular accusative

The basic accusative feminine article is often heard as τη in speech, but την is the full form.

Before a vowel, Greek normally keeps the final -ν, so:

• την ελαστικότητα is correct

Since ελαστικότητα begins with ε, the -ν stays.

So here, την is exactly what you should expect.

Αλλάζει is the:

• present tense
• 3rd person singular
• from the verb αλλάζω = to change

So αλλάζει means:

• he/she/it changes
• or is changing, depending on context

In this sentence, the subject is η ενυδάτωση, so the meaning is:

• hydration changes
• or hydration is changing

In natural English, changes is usually the best choice here.

It can mean either one, depending on context.

Greek present-tense forms often cover both:

• a general truth / habitual action → changes
• an action happening now → is changing

So without extra context, Η ενυδάτωση αλλάζει την ελαστικότητα is most naturally understood as a general statement:

Hydration changes elasticity.

Yes, both are feminine singular nouns.

You can often guess gender from common endings:

• -ωση as in ενυδάτωση is very often feminine
• -τητα as in ελαστικότητα is also very often feminine

The article confirms this:

• η ενυδάτωση
• την ελαστικότητα

So even if you are unsure from the ending alone, the article tells you the gender.

Because many feminine nouns have the same form in the nominative and accusative singular.

So:

• nominative: η ελαστικότητα
• accusative: την ελαστικότητα

The article changes, but the noun itself stays the same.

This is very common in Greek and can feel strange to English speakers at first, because the difference is shown mainly by the article and the sentence role.

The word order is:

Subject + Verb + Object

• Η ενυδάτωση = subject
• αλλάζει = verb
• την ελαστικότητα = object

So this is a very straightforward Greek sentence.

Greek word order is more flexible than English because case marking helps show who is doing what, but SVO is very common and natural.

Yes. Greek allows more flexibility than English.

For example, you might also see:

• Την ελαστικότητα αλλάζει η ενυδάτωση.

That still means essentially the same thing, because the articles and cases show the roles:

• η ενυδάτωση = subject
• την ελαστικότητα = object

However, changing the order usually changes the emphasis. The original sentence is the most neutral and natural if you are just stating a fact.

Greek often uses the definite article more freely than English, especially with nouns that are abstract or general.

So:

• Η ενυδάτωση αλλάζει την ελαστικότητα is perfectly natural Greek

In English, a more idiomatic translation might drop the articles:

• Hydration changes elasticity

But in Greek, keeping the articles sounds normal and often expected.

So you should not assume that Greek articles always translate word-for-word into English articles.

A simple pronunciation guide is:

ee en-ee-THA-to-see al-LA-zee teen e-la-stee-KO-ti-ta

A few helpful notes:

• η sounds like ee
• δ in ενυδάτωση sounds like the th in this
• ζ in αλλάζει sounds like z
• αι in αλλάζει sounds like e in met
• την sounds like teen here

A rough transliteration is:

I enydátosi allázei tin elastikótita

The accent marks show which syllable is stressed.

In this sentence:

• ενυδάτωση → stress on δά
• αλλάζει → stress on λά
• ελαστικότητα → stress on τό

So you should say:

• en-ee-THA-to-see
• al-LA-zee
• e-la-stee-KO-ti-ta

Stress matters in Greek, so it is important to notice and learn the accent marks from the beginning.

The dictionary form is αλλάζω = to change.

Greek verbs are normally listed in the 1st person singular present form, so you look up:

• αλλάζω

not

• αλλάζει

From that dictionary form, you can recognize:

• αλλάζω = I change
• αλλάζεις = you change
• αλλάζει = he/she/it changes

So if you meet αλλάζει in a sentence, the form to search for is αλλάζω.