Attometer
An attometer (am) is a unit of length in the metric system, equal to one-quintillionth of a meter (1 am = 10⁻¹⁸ meters). This unit is extremely small, even smaller than a femtometer, and is used in theoretical physics to describe distances at the quantum level, such as within particles or in advanced models of spacetime. However, attometers are rarely used in practice because most known physical structures, including subatomic particles, are still larger than this. The attometer mainly appears in scientific equations or hypotheses dealing with concepts beyond current experimental capabilities.
Cubit (Greek)
The Greek cubit is an ancient unit of length based on the forearm’s length—from the elbow to the tip of the middle finger. In ancient Greece, it typically measured about 18 to 20 inches (approximately 45 to 50 centimeters), though the exact length could vary by region and period.
The Greek cubit was widely used in architecture, construction, and land measurement. It played a crucial role in building temples, monuments, and other structures in classical Greece.
Key points:
Greek cubit ≈ 18 to 20 inches (45–50 cm)
Based on the length of the forearm
Used in ancient Greek construction and land surveying
Important for classical architecture and engineering
This unit reflects how ancient civilizations used the human body as a natural measuring tool before standardized systems.
No conversions available for length.