A square nanometer (often abbreviated as nm²) is a unit of area in the International System of Units (SI) and is used to describe extremely small areas, especially in the context of nanotechnology and scientific research.
One square nanometer is equal to one billionth of a square meter (1 x 10^-9 m²). In other words, it takes one billion square nanometers to make up one square meter.
To give you a sense of scale, a square nanometer is incredibly tiny. It's often used to describe the size of individual atoms, molecules, or the features on nanoscale devices. Nanotechnology deals with structures and materials on this extremely small scale, where traditional units of area, like square meters or even square millimeters, are impractical.
A township can have different meanings depending on the country and context in which it is used:
United States and Canada (North America): In North America, a township is a specific type of administrative division used in land survey systems. In the United States, townships are most commonly used in the Midwest and some other parts of the country. In Canada, townships are used primarily in the eastern provinces. These townships are typically a square area of land, typically six miles by six miles (36 square miles), or a similar configuration depending on the specific survey system used. Townships can be further divided into smaller units, such as sections, for land management and ownership purposes.
South Africa: In South Africa, a township refers to a residential area established during the apartheid era for non-white citizens. These areas were segregated from the main cities and towns and often experienced poor living conditions. Today, many townships have evolved and have improved living conditions, but the term is still associated with historically segregated communities.
Australia: In Australia, the term "township" is often used to refer to small rural towns or settlements. These are typically smaller than cities or larger towns and often serve as centers for local communities.