Millimetre

From Encyclopedia Jr, free information reference for Kids

A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.

micrometre << millimetre << centimetre << decimetre << metre << decametre << kilometre

[edit] Equivalence to other units of length

1 millimetre is equal to:

• 0.001 metres, which can be represented by 1 E-3 m (1 metre is equal to 1,000 millimetres)
• 0.1 centimetres (1 centimetre is equal to 10 millimetres)
• about 0.03937 international inches (5 international inches is equal to 25.4 millimetres exactly)

[edit] Unicode symbols

For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:

• millimetre (㎜) - code 339C
• square millimetre (㎟) - code 339F
• cubic millimetre (㎣) - code 33A3

They are useful only with East Asian fixed-width CJK fonts, because they are equal in size to one Chinese character.

[edit] See also

• 1 E-3 m
• SI
• SI prefix
• Metric system
• Orders of magnitude
• Conversion of units, for comparison with other units of length

[edit] References

• CJK Compatibility excerpt from The Unicode Standard, Version 4.1.