#1 of forty-four · mid class
ก
ko kai
ก ไก่ · chicken
Mid class อักษรกลาง
Mid class is tonally neutral — every tone mark maps to exactly one tone.

A consonant’s class exists for one reason: it decides the tone. Mid class is tonally neutral — every tone mark maps to exactly one tone. Here’s every outcome for ก as the initial:
| Syllable | – No mark | ◌่ mái èek | ◌้ mái thoo | ◌๊ mái trii | ◌๋ chattawa |
|---|---|---|---|---|---|
| Liveopen or sonorant end | mid | low | falling | high | rising |
| Deadstop end or short vowel | low | low | falling | — | — |
Live syllable — open or sonorant end
Dead syllable — stop end or short vowel
Change the initial to another class and the same marks produce different tones — that shift is what makes tone a small system, not 44 separate facts. Derive tones on the Tones surface →
Looks like — watch the shape
The tell: ถ has a small head-loop at the top-left and a longer tail; ก has neither — just a plain shoulder.ก is /k/ mid · ถ is /tʰ/ high.
The tell: ภ grows a tall vertical stem on its right side; ก stays low and compact, with no ascender.ก is /k/ mid · ภ is /pʰ/ low.
Sounds like — watch the spelling
Same initial /k/:
ก stands alone — no other consonant makes this initial sound, so it’s always ก. One of the easy ones to spell.
Same final /k/ — identical at a word’s end:
Start at the head — the little loop — then one continuous stroke. Written between the guide lines, the body sits in the middle band.
Indic — Sanskrit k. The base /k/, common everywhere.