मेज़ की सतह साफ है।

A natural breakdown is:

• मेज़ = table
• की = of / possessive marker
• सतह = surface
• साफ = clean
• है = is

So the structure is basically:

• मेज़ की सतह = the table’s surface / surface of the table
• साफ है = is clean

A very literal word-for-word order would be:

table of surface clean is

Hindi often builds possession this way: X का/की/के Y = Y of X / X’s Y.

Because का/की/के agrees with the noun that comes after it — the thing being possessed — not with the possessor.

Here, the possessed noun is सतह (surface), and सतह is feminine singular, so Hindi uses की.

Compare:

• मेज़ की सतह = the table’s surface
  (सतह = feminine singular, so की)

If the following noun were masculine singular, you would use का.
If it were plural (or masculine plural), you might use के.

This is one of the most important things to remember about का/की/के.

It agrees with सतह, not मेज़.

That can feel unusual to English speakers, because in English we think of the table’s surface, where table’s seems tied to table. In Hindi, the possessive marker changes according to the noun that follows it.

So in:

• मेज़ की सतह

the form की is chosen because सतह is feminine singular.

In standard Hindi:

• मेज़ is usually treated as feminine
• सतह is feminine

However, in this sentence, the key reason for की is the gender of सतह, because that is the noun the possessive marker agrees with.

Also, the main verb है does not show gender here, so you do not see feminine marking on the verb.

Because साफ is an indeclinable adjective in Hindi. That means it usually stays the same regardless of gender or number.

So you can say:

• कमरा साफ है = the room is clean
• मेज़ साफ है = the table is clean
• सतह साफ है = the surface is clean
• किताबें साफ हैं = the books are clean

In all of these, साफ stays साफ.

This is different from adjectives like बड़ा, which do change:

• बड़ा कमरा
• बड़ी मेज़
• बड़े कमरे

But साफ does not behave like that.

Because the subject here is singular:

• मेज़ की सतह = the table’s surface (one surface)

So Hindi uses singular है.

If the subject were plural, you would use हैं instead. For example:

• मेज़ों की सतहें साफ हैं = the tables’ surfaces are clean

So:

• singular subject → है
• plural subject → हैं

Because the meaning is more specific.

• मेज़ साफ है = the table is clean
• मेज़ की सतह साफ है = the table’s surface is clean

The second sentence focuses only on the surface. That can matter if, for example, the top of the table is clean but the legs, edges, or underside are not.

So सतह adds precision.

The normal, natural order is:

• मेज़ की सतह साफ है

That is:

1. noun phrase (the table’s surface)
2. adjective/predicate (clean)
3. copula (is)

This is the most straightforward way to say it.

Hindi does allow some flexibility for emphasis, but for a learner, this sentence is the best standard pattern to remember:

[noun phrase] + [adjective] + है

मेज़ is pronounced roughly like mez.

The letter ज़ represents a z sound. The dot underneath is called a nukta, and it helps show sounds that entered Hindi through Persian, Arabic, and other languages.

So:

• ज = usually like j
• ज़ = z

In everyday writing, you may sometimes see मेज without the dot, but मेज़ is the more precise spelling for the z sound.

Yes. मेज़ की सतह साफ है। is a complete and natural sentence.

It sounds a bit more formal or precise than simply saying मेज़ साफ है, because सतह is a more exact word. But it is perfectly normal Hindi, especially in description, instructions, cleaning contexts, or more careful speech and writing.