點解1000就叫會1k

這是來自國際單位制 SI 定下的符號
圖片參考：http://hk.yimg.com/i/icon/16/6.gif

國際單位制

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國際單位制(符號：SI，來自法文的le Système international d'unités)，又稱公制或米制，舊稱「萬國公制」，是一種十進位進位系統，是現時世上最普遍採用的標準度量衡單位系統。國際單位制源自18世紀末科學家的努力，最早於法國大革命時期的1799年被法國作為度量衡單位。詳見國際單位制基本單位、國際單位制導出單位和國際單位制詞頭條。
其中有定下 k 是代表 kilo- 亦即 10 的 3 次方, 亦即是 1000
kilo- (symbol: k) is a prefix in the SI and other systems of units denoting 103 or 1000. For example:

one kilogram is 1000 grams
one kilometre is 1000 metres
one kilowatt is 1000 watts
one kilojoule is 1000 joules
Officially adopted in 1795 (though in common use before that), it comes from the Greek χίλιοι ("khilioi"), meaning thousand.
"Kilo" is often used by itself as an abbreviation for "kilogram". Also, technical people often use the term "k", pronounced like the letter, to refer to a thousand of something, especially units of money or population.[citation needed] On the other hand, the kilometre is sometimes informally abbreviated to "k"; in this context it is widely used in the United States in reference to running races (for example, a "10k"). "Click" or "klick" can also be heard in informal usage, especially in the U.S. military.
http://en.wikipedia.org/wiki/Kilo
圖片參考：http://hk.yimg.com/i/icon/16/11.gif

這是因英文kilogrom的中文意思是一公斤=1000克,kilo--是公斤,公里=1000公尺,所以中文"千"的數量就用英文"KILO"的縮寫"K"表示了.例如"KG"代表1000克,"KM,"代表1000公尺,等.