The total length of all phone numbers (STD code and the phone number) in India is constant at 10 digits, for example 7513200000 signifies a STD code i.e. 751 Gwalior & the phone number 3200000. Land line numbers are at most 8 digits long (usually in major metros).
Millimeter definition, a unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch. See more.
A metric ruler is use to measure centimeter and millimeters. 1 centimeter (cm) = 10 millimeters (mm) A centimeter is a unit of length in the metric system. There are 2.54 centimeters in an inch. A 12 inch ruler is about 30 cm long.