Which of the following is NOT a standard unit in the metric system?

The foot is not a standard unit in the metric system; instead, it belongs to the imperial system of measurement. The metric system is based on units that are universally accepted across most of the world, and it includes the liter for volume, gram for mass, and meter for length. These units are part of a decimal-based system, which makes conversion between them straightforward by using powers of ten. In contrast, the foot, as part of the imperial system, has a more complex conversion system (e.g., 12 inches make a foot), which is one of the reasons the metric system is preferred for scientific and international use. Understanding the distinction between these two systems is important for anyone involved in fields that require precise measurement, including advertising design and other related areas.