You can think of fizz as one small event repeated thousands of times: a bubble climbs, reaches the surface and breaks. One bubble alone would be silent. Thousands together make a thin, steady , and that is inside the word itself. Every use of fizz keeps some part of that picture: the bubbles you see, the sound you hear, the drink that is full of both, or something moving so fast that the air as it passes.
From the word’s history
The source marks fizz as onomatopoeia — a word made out of the sound it names. That is why the picture and the pronunciation match so closely: the long z at the end is itself a hiss.
資料把 fizz 標成擬聲字（onomatopoeia），也就是照著聲音造出來的字。所以畫面和讀音幾乎重疊：字尾拖長的 z，本身就是那個嘶聲。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), fizz noun/verb entries, etymology_text: "Onomatopoeia."
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