Looking again at the explainthatstuff.com QR code up above, we have: 1  Quiet zone: An empty white border that makes it possible to isolate the code from among other printed information (for example, on a dirty envelope, among the black and white print of a newspaper, or on smudged product packaging).
Valid units must be of the length type. âºâº Definition: Centimeter. A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundreth of a metre, the current SI base unit of length. A centimetre is part of a metric system. It is the base unit in the centimetre-gram-second system of units. A corresponding unit of area is the square centimetre.
The millimeter (mm) is a unit of length in the metric system and is equal to one thousandth of a meter. It is also equal to 0.1 centimeter, 1,000 micrometres and 1,000,000 nanometres. Similar to mm, the centimeter is also a unit of length in the metric system and is equal to one hundredth of a meter. 1 centimeter is equal to 10 millimeter, 10,000 micrometers and 10,000,000 nanometers. Image Courtesy: future-edge.com.