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 How small is...
 a centimeter?
 Definition: Centi means 1 part in 100. Therefore, there are 100 centimeters in a meter.
 Notation: cm
 Comparison: A centimeter of hair similar to this one, laid out side by side, could contain more than 116 strands.
 a millimeter?
 Definition: A millimeter is ^{1}/_{1,000} of a meter.
 Notation: mm
 Comparison: If you laid out 1,000 strands of hair similar to the one shown on the right, side to side, the width would be 86 millimeters.
 micro?
 Definition: Micro is a prefix meaning onemillionth or 10^{6} units.
 There are 1,000,000 micrometers (or microns) in a meter.
 Notation: µm
 Comparison:A strand of hair can be anywhere from 20 µm (microns) to200 µm in diameter.
 nano?
 Definition: Nano is a prefix meaning onebillionth, or 10^{9},or ^{1}/_{1,000,000,000}!
 Notation: nm
 Comparison: This strand of hair is approximately 150,000 nm (nanometers) wide.
 If you were a three nanometers tall, a cross section of this strandcould look like the Grand Canyon.
 an Angstrom?
 Definition: An Angstrom is 1x10^{10}meters, and can be used to measure atomic sizes.
 Notation: Å
 Comparison: This strand of hair is about 1,500,000 Å in diameter.
 When is...
 a centimeter used?
 The common use of the centimeter is to refer to a wafer size.
 Our most commonly used wafer is 10.16 cm in diameter
 a millimeter used?
 The wrenches used in the cleanroom to maintain the equipment are in the millimeter range.
 a micron used?
 Our "large" measurements are usually in microns.
 Typical hair diameter: 86 microns
 Common oxide thickness: 1.5 microns
 a nanometer used?
 More refined measurements in the cleanroom are on the nano scale.
 an Angstrom used?
 This measurement is not commonly used in the cleanroom.

A strand of student hair magnified 10 times. *Width is approximately 86 µm 