Millimetre

Millimetre
Ruler with millimeter and centimeter marks.png
Ruler with millimetre and centimetre marks
Unit information
Unit systemSI derived unit
Unit ofLength
Symbolmm 
Named afterThe metric prefix mille (Latin for "one thousand") and the metre
Unit conversions
1 mm in ...... is equal to ...
   micrometres   1×103 μm = 1000 μm
   centimetres   1×10−1 cm = 0.1 cm
   metres   1×10−3 m = 0.001 m
   kilometres   1×10−6 km
   inches   0.039370 in
   feet   0.0032808 ft

The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.

One millimetre is equal to 1000 micrometres or 1000000 nanometres. A millimetre is equal to exactly ​5127 (approximately 0.039370) of an inch.

Definition

Since 1983, the metre has been defined as "the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second".[1] A millimetre, 1/1000 of a metre, is therefore the distance travelled by light in 1/299792458000 of a second.

Other Languages
Afrikaans: Millimeter
العربية: مليمتر
aragonés: Milimetro
asturianu: Milímetru
azərbaycanca: Millimetr
беларуская: Міліметр
беларуская (тарашкевіца)‎: Мілімэтар
български: Милиметър
bosanski: Milimetar
català: Mil·límetre
Чӑвашла: Миллиметр
čeština: Milimetr
Cymraeg: Milimetr
dansk: Millimeter
Deutsch: Millimeter
Ελληνικά: Χιλιοστόμετρο
emiliàn e rumagnòl: Milìmeter
español: Milímetro
Esperanto: Milimetro
euskara: Milimetro
فارسی: میلی‌متر
français: Millimètre
Frysk: Milimeter
furlan: Milimetri
galego: Milímetro
客家語/Hak-kâ-ngî: Hò-mí
한국어: 밀리미터
հայերեն: Միլիմետր
हिन्दी: मिलीमीटर
Bahasa Indonesia: Milimeter
interlingua: Millimetro
íslenska: Millimetri
italiano: Millimetro
Basa Jawa: Milimèter
ქართული: მილიმეტრი
қазақша: Миллиметр
Kiswahili: Milimita
kurdî: Milîmetre
Latina: Millimetrum
latviešu: Milimetrs
Limburgs: Millimeter
македонски: Милиметар
मराठी: मिलीमीटर
მარგალური: მილიმეტრა
Mìng-dĕ̤ng-ngṳ̄: Hò̤-mī
Nederlands: Millimeter
norsk: Millimeter
norsk nynorsk: Millimeter
oʻzbekcha/ўзбекча: Millimetr
پنجابی: ملی میٹر
polski: Milimetr
português: Milímetro
русский: Миллиметр
Scots: Millimetre
shqip: Milimetri
sicilianu: Millìmitru
Simple English: Millimetre
slovenčina: Milimeter
slovenščina: Milimeter
Soomaaliga: Millimeter
српски / srpski: Milimetar
srpskohrvatski / српскохрватски: Milimetar
svenska: Millimeter
Türkçe: Milimetre
українська: Міліметр
اردو: ملی میٹر
vèneto: Miłimetro
Tiếng Việt: Milimét
Winaray: Milimetro
粵語: 毫米
中文: 毫米