It doesn't use a long vowel in standard pronunciation, but a short one.
So it's: /sɪz/

Interested in Language
"si:z", or "s-schwa-z". The plural of any word ending in an /s/ sound follows the same rule.
I am not a teacher.
It doesn't use a long vowel in standard pronunciation, but a short one.
So it's: /sɪz/
You thought what was the same as "diseases"?
Hi teachers.
Would you please type me the IPA of these words? I can't find the IPAs of them online.
Chevrolet
Brendan Duggan
This Wikipedia page tells you about Chevrolet. If you can't access that: Chevrolet (/ˌʃɛvrəˈleɪ/ SHEV-rə-LAY)
/'brɜndən'dʌgən/
If you look very closely at the IPA, you'll see two tiny marks—one before the first syllable, at the bottom, and one before the last syllable, at the top. These mark stress.
A stress mark at the top marks primary stress and a stress mark at the bottom marks secondary stress. So in American English, both syllables are indeed stressed, but one has more stress than the other.
Interestingly (or not), most Brits would stress these syllables the other way round, i.e., with primary stress on the first syllable.