thermodynamics

IPA /ˌθɜrmoʊdaɪˈnæmɪks/ Syllables 5 · thur·moh·dahy·na·muhks Stress 4th syllable
thur·moh·dahy·NA·muhks
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Americans pronounce thermodynamics as thur-moh-dahy-NA-muhks (/ˌθɜrmoʊdaɪˈnæmɪks/). The T between vowels softens into a quick D-like flap, so it sounds closer to a D than a crisp T. Stress falls on the fourth syllable — keep everything else short and quick.

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Common mistakes

Saying a hard "T" in the middle.

In "thermodynamics", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.

Pronouncing the vowel before M/N too pure.

In "thermodynamics", the "a" vowel before M or N raises and fronts toward [eə] — the tongue pulls up and forward, breaking the vowel into a tense glide as it anticipates the nasal. The "/æ/" vowel raises and fronts before M or N — tongue pulls up and forward, producing a tense [eə] glide (between /e/ and /ə/). Not a pure /æ/.

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Why it sounds different

Why "thermodynamics" sounds like THUR·moh·dahy·NA·muhks.

In "thermodynamics", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, a hallmark of natural-sounding American speech. So instead of thur·moh·tahy·NA·muhks, you get THUR·moh·dahy·NA·muhks.

In real conversation

Hear "thermodynamics" in the wild.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.

"The experiment demonstrated the principles of thermodynamics."
dhee ihk·SPEH·ruh·muhnt DEH·muhn·stray·duhd dhuh PRIHN·suh·puhlz uhv thur·moh·dahy·NA·muhks
Same pattern

Words that work the same way.

All of these share phonetic features with this word — same trick.

BAHY·oh·duh·VUR·suh·teebiodiversityKAN·duh·daytscandidatesSUR·kuhm·STAN·suhzcircumstancesSTAN·der·DAHYZDstandardizedMA·thuh·MA·tuhksmathematicsAN·tee·bahy·AH·tuhksantibioticsMAHY·kruh·SKOHPmicroscopeKA·muh·RAH·duh·reecamaraderie
Watch out

Common pronunciation mistakes in American English.

The textbook way isn't wrong — it's just not how anyone actually says it.

01

Saying a hard "T" in the middle.

In "thermodynamics", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.

thur-moh-tahy-NA-muhks→THUR·moh·dahy·NA·muhks
02

Pronouncing the vowel before M/N too pure.

In "thermodynamics", the "a" vowel before M or N raises and fronts toward [eə] — the tongue pulls up and forward, breaking the vowel into a tense glide as it anticipates the nasal. The "/æ/" vowel raises and fronts before M or N — tongue pulls up and forward, producing a tense [eə] glide (between /e/ and /ə/). Not a pure /æ/.

thur-moh-dahy-NA-muhks→THUR·moh·dahy·NA·muhks
03

Stressing the wrong syllable.

Stress falls on the fourth syllable, not the others. Stretch NA — keep everything else short and quick.

THUR·MOH·DAHY·na·MUHKS→THUR·moh·dahy·NA·muhks
04

Pronouncing the unstressed syllable too fully.

Don't pronounce the fourth syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.

thur·moh·dahy·NA·MUHKS→THUR·moh·dahy·NA·muhks
Questions

Questions people ask about this.

How is "thermodynamics" stressed in American English?
Stress falls on the fourth syllable — say "NA" with a longer, fuller vowel and keep every other syllable short and quick. The respell "thur-moh-dahy-NA-muhks" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why doesn't the T sound like a T in "thermodynamics"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "thermodynamics" sounds closer to "thur-moh-dahy-NA-muhks" than to a crisp-T pronunciation. This is the flap-T rule, one of the most distinctive sounds of casual American speech.
Why does the fifth syllable in "thermodynamics" reduce to "uh"?
Unstressed syllables in American English collapse toward a schwa — a lazy, neutral "uh" sound. The full vowel is what textbooks teach, but in actual American speech every unstressed vowel reduces. The respell "thur-moh-dahy-NA-muhks" shows the reduced form so you can hear the casual rhythm directly.
How do I pronounce the R in "thermodynamics"?
Americans use a relaxed retroflex R: the tongue curls back rather than rolling, and the R is one continuous sound with the vowel before it — not two separate sounds. Don't try to pronounce a separate vowel followed by a separate R. Treat them as a single shape.

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