The word hertz is a name, not a plural of hert. The unit (cycle per second) is named for Heinrich Rudolf Hertz (1857-1894).
You spell it with z, the reason why is because when you take s and put it in organize it would not look or sound the same.
In the United States you spell it with a Z, but in other countries it is spelled with an S.
Australians typically spell "organise" with an "s" instead of a "z" as "organise."
Azul. When pronouncing it, the "Z" is pronounced as an "S".
In US English, it is spelled with a 'z' In English outside the US it can be spelt with either a 'z' or an 's'; "apologise" is the most common usage in the UK.
spelling with an 's' is the British way, with a 'z' from America and Canada
hertz
In Portuguese we spell it Brasil, but the "s" is pronounced as a "z".
HI, of, Is,
Yes. It has a z in American English but an s in British spellling.
The correct spelling is "analyze." It is spelled with a "z" instead of an "s."
"Sudzy" is spelled s-u-d-z-y.