When typing numbers with unit, should there be a space or no space between the units? I have seen both conventions to varying degrees. In general, it is more formal to type a space between units, ideally a non-breaking space, with only a few exceptions, but many times in conventional and informal use, numbers are typed without a space to separate the units.
20191125/DuckDuckGo space or no space between units
20191125/https://english.stackexchange.com/questions/2794/punctuation-with-units