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How do we tell whether 2 hiragana should fit in 1 "mora" or 2?

For example, why is it that [四季](http://www.csse.monash.edu.au/~jwb/cgi-
bin/wwwjdic.cgi?1MUE%E5%9B%9B%E5%AD%A3) and
[士気](http://www.csse.monash.edu.au/~jwb/cgi-
bin/wwwjdic.cgi?1MUE%E5%A3%AB%E6%B0%97) are pronounced as "Shiki" 1 mora,
whereas [式](http://www.csse.monash.edu.au/~jwb/cgi-
bin/wwwjdic.cgi?1MUE%E5%BC%8F) and
[指揮](http://www.csse.monash.edu.au/~jwb/cgi-
bin/wwwjdic.cgi?1MUE%E6%8C%87%E6%8F%AE) are pronounced as "Shi Ki" 2 morae?
**N.B.** _Links bring to a dictionary_.

What I meant is that according to the audio files I've linked to in the
question, there is a significant difference in the "gap" between the two
hiragana.

Why is it that although 式 and 四季 have the same hiragana (しき), 式 has both the
clear sounds of "shi" and "ki" (2 distinct "sounds") whereas in 四季 the し and き
are slurred to form a single "sound" ?
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pronunciation morae
How do we tell whether two hiragana should fit in one mora or two?
I think that's still 2 mora. The only time multiple kana will be a single mora
is when the second one is smaller, like しゃ (sha) and きょ (kyo).

I think your real questions is about the difference in stresses, and I think
you just have to learn by experience for that.

The little つ is an exception to this 'rule', as sawa pointed out below. (I
wasn't aware of this.)
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I think you are confusing the morae count with syllables with silenced vowel.
In spoken Japanese, there are some syllables, for example く し す etc, that are
pronounced with silent vowel in some particular conditions. For example, in
はじめまして the し is pronounced as 'sh' with the 'i' silenced, as in "ha-ji-me-ma-
sh-te".

On top of that, there is also pitch accent. Different words that are formed by
the exact same syllable sequences may be pronounced with different pitch
accent; the famous example being はし for chopsticks vs bridge.

This is purely my hypothesis, but I think pitch accent is one of the
conditions for the silenced vowel syllables to be silenced. Here is sort of
prove: open [this particular
website](http://sp.cis.iwate-u.ac.jp/sp/lesson/j/doc/accentl.html). Plug in
your headphones. Then try comparing three accents for はしが (edge, chopstick and
bridge). You'll notice that the し for chopstick is vowel-silenced ("ha-sh-
ga"). Now trace through that second column and try listening to あきが (autumn)
and かきが (oyster), and compare them with their other accents. You'll notice
that the き in 'autumn' and 'oyster' is also vowel-silenced. So I think that
pitch accent does influence whether the vowel is silenced or not.

Back to your しき, here are the pitch accents that I hear:

> 四季 : LL : sh-ki  
>  士気 : LL : sh-ki  
>  式 : HL : shi-ki  
>  指揮 : HL : shi-ki
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You seem to be confusing morae and syllables. Syllables are units that have a
nucleus which is typically either a vowel (which may be both a
[monophthong](http://en.wikipedia.org/wiki/Monophthong) or a
[diphthong](http://en.wikipedia.org/wiki/Diphtong)) or a
[sonorant](http://en.wikipedia.org/wiki/Sonorant), such as /l/, /m/, /n/ or
/r/. The English words "ski" [ski:] and "sick" [sɪk] have just one syllable,
while the word button [bʌ·tn] has two, with "n" being the nucleus of the
second syllable.

It's important to note that syllables may vary greatly in length, depending on
how many consonant they have, whether they are stressed, whether they have a
diphthong or a monophthong and whether they have a long, short or elided
vowel. The second syllable in "button" ([tn]), for instance, is very short
since it is unstressed and it doesn't have any vowel at all, but rather the
sonorant "n" that isn't really pronounced for a long time in English (in other
languages it may behave differently). Syllables with diphthongs or long
vowels, on the other hand are quite longer (this difference is more pronounced
in some English accents than in other).

Morae, on the other hand, are quite different from syllable. These are
rhythmical units of (relatively) fixed length, and they only count time - not
the existence or absence of a nucleus and not even the existence of sound (the
Japanese _small tsu_ , っ, may count as a mora even in the cases where it ends
up being just a silent pause). You can imagine a mora as the beat of an
inaudible metronome that goes inside the speaker's head and represents the
tempo of his or her speech: when you speak very fast, a single mora may take
as little as a tenth of a second, and when you dictate something in an
exaggerated manner it can take as much as two seconds.

Since mora is entirely a unit of length and not a standard structure for how
phonemes may be joined together, you can see that long vowels and geminated
(doubled) consonants take two morae, and the consonant 'n', when it comes
without a vowel, takes a whole mora for itself. This means that even when
there's a muted vowel (such as the /i/ in 士気), the consonant still takes an
entire mora on its own. I believe that if you'd count the length of the audio
samples on WWWJDIC you'll notice that they actually have roughly the same
length (despite some of them having a muted vowel and some of them not).

What confused you, of course, was interpreting the Japanese examples as the
English syllables you've heard and trying to count morae according that. But
just as the concept of mora is not really useful for understanding when
applied to English (at least when it is not sung or solemnly recited), the
concept of syllable is quite alien to Japanese. You can divide Japanese to
syllables if you want, but then you'd be dividing it by English (or German or
Chinese or whatever) standards. Japanese phonology per se (and I'm not talking
about unprovable universal phonology models here) has no internal concept of a
syllable. Only the morae count.
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First, you probably misunderstood the meaning of "mora". Morae are essentially
syllables, except that ん and double consonants also constitute morae.

Second, I think you were mislead by the different pronunciations on the
website. They should sound exactly the same -- or, to be precise, all the
pronunciations you hear can represent all of the words you mention.

Pitch is not an issue here as all these words have the same pitch, namely HL.
(You can confirm the pitch in the [dictionary page for
しき](http://dic.search.yahoo.co.jp///dsearch?p=%E3%81%97%E3%81%8D&stype=prefix&dic_id=ss_dic_jj&oq=&ei=UTF-8&xargs=0&pstart=1&b=1%29).
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2011-10-21T18:24:19.830
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The recordings for the words you linked were made at different times. They are
not different for phonological reasons, but simply because they were made
separately -- in other words, they are interchangeable, and there is no
distinctive feature that you are missing out on.

Test it out on a native speaker and see if they can correctly and consistently
identify the 3 different recordings as the header words. They won't.

Otherwise, as others have pointed out, both words (or realizations) are 2
morae (or syllables). The fact that the first vowel is more or less voiceless
is irrelevant. Pitch is also the same in the recordings and is irrelevant
here.
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