Dekameter
A dekameter (dam) is a unit of length in the metric system, equal to 10 meters. It sits between a meter and a hectometer in size. Although it is an official part of the metric system, the dekameter is rarely used in everyday life, education, or even science. For example, a small swimming pool might be around 2 dekameters long. The symbol for dekameter is "dam". Since most people prefer using meters or kilometers, the dekameter is more of a theoretical unit used mainly for teaching the structure of the metric system.
Earth Polar Radius
The Earth's polar radius is the distance from the center of the Earth to the North or South Pole. It measures the Earth’s radius along its rotational axis.
Its value is approximately 6,356.8 kilometers (about 3,949.9 miles).
The Earth is an oblate spheroid, so the polar radius is slightly shorter than the equatorial radius due to the planet's flattening at the poles.
This measurement is crucial for geodesy, understanding Earth’s shape, and satellite navigation.
Key facts:
Polar radius ≈ 6,356.8 km
Smaller than equatorial radius by about 21.3 km
Important for precise Earth modeling and mapping
The difference between the polar and equatorial radius reflects the Earth’s rotation and its effect on the planet’s shape.
No conversions available for length.