पानी तरल है।

A common learner-friendly pronunciation is:

• पानी = pānī
• तरल = taral
• है = hai

So the whole sentence is roughly:

pānī taral hai

A few notes:

• पा has a long aa sound.
• नी has a long ee sound.
• In तरल, both a vowels are short.
• है is often pronounced somewhat like hai, though in careful speech it is closer to hɛ than English high.

The sentence breaks down like this:

• पानी = water
• तरल = liquid / fluid
• है = is

So the structure is:

water + liquid + is

This is a very normal Hindi pattern: subject + description + है.

Because Hindi usually places the verb at the end of the sentence.

English says:

Water is liquid.

Hindi says literally:

Water liquid is.

This is one of the most important word-order differences between English and Hindi. In simple equational/descriptive sentences, the form of to be often comes last.

Hindi often does not use articles the way English does.

So:

• पानी तरल है can mean Water is liquid
• Depending on context, it can also feel close to Water is a liquid

Hindi usually leaves a/an/the unexpressed unless something needs special emphasis or clarity.

If you really wanted to say Water is a liquid, you might also hear:

• पानी एक तरल है
• पानी एक तरल पदार्थ है

But in many normal contexts, एक is not necessary.

It can function a bit like either, depending on how you think about it.

In this sentence, तरल is describing पानी, so it works like an adjective: liquid.

But in Hindi, words like this can also feel noun-like in some contexts, especially in scientific or definitional language. So learners may see it as:

• Water is liquid
  or
• Water is a liquid

Both are useful ways to understand it.

In this sentence, तरल does not change.

That is because many Hindi adjectives are indeclinable, meaning they keep the same form regardless of gender and number.

So you can have:

• पानी तरल है
• यह चीज़ तरल है
• वे पदार्थ तरल हैं

In all of these, तरल stays the same.

पानी is generally treated as masculine in Hindi.

In this particular sentence, that does not visibly affect तरल, because तरल does not change form here.

It also does not change है, because है is used for singular regardless of masculine or feminine:

• पानी तरल है
• चाय गरम है

So the gender of पानी is good to know, but it does not create an obvious change in this sentence.

Because पानी is singular.

Use:

• है for singular
• हैं for plural, and also for formal you

So:

• पानी तरल है = Water is liquid.
• ये पदार्थ तरल हैं = These substances are liquid.

Yes. द्रव is another word connected with liquid, and it is especially common in scientific or formal contexts.

Roughly speaking:

• तरल = liquid / fluid
• द्रव = liquid, often more technical/scientific

So both can appear, but तरल may sound a bit more like a descriptive property, while द्रव can sound more like a scientific category.

You may also see:

• पानी एक द्रव है
• जल एक द्रव है

Yes, but the style changes.

• पानी is the everyday word for water
• जल is more formal, literary, religious, or scientific

So:

• पानी तरल है sounds ordinary and natural
• जल तरल है sounds more formal or textbook-like

Both are correct.

It is grammatically correct, but it sounds a bit like a textbook, science lesson, or definition rather than casual conversation.

In real life, people are more likely to say things like:

• पानी ठंडा है। = The water is cold.
• पानी साफ़ है। = The water is clean.
• पानी उबल रहा है। = The water is boiling.

So पानी तरल है is natural in an explanatory or educational context, but not something people would say very often in ordinary conversation.