Quantity/quantities - English Vocabulary, Grammar and Idioms

Quantity means the amount of something, so when do we use it in plural form? Can you give me some examples? ... These pills come in two quantities ... Quantity/quantities EnglishasaSecondLanguage EnglishVocabulary,GrammarandIdioms Tbt October9,2010,9:23am #1 Quantitymeanstheamountofsomething,sowhendoweuseitinpluralform? Canyougivemesomeexamples? Manythanks Mister_Micawber October9,2010,9:30am #2 Thesepillscomeintwoquantities:100inthesmallbottleand500inthelargebottle. Beeesneees October9,2010,9:47am #3 Youuseitinthepluralformwhenyouhavemorethanoneamountofsomethingtoconsider: Whenordering,notedownthesizes,colours,andquantitiesrequiredofeachitem. Iftakeninlargequantities,thedrugcanresultinliverfailure.