Kilometer (km)
Definition: A kilometer (km) is equal to 1,000 meters. It is a common unit for measuring large distances, especially in geography and transportation, providing a practical scale for road signs and geographic mapping.
History: Introduced in the metric system during the late 18th century, the kilometer was established to replace inconsistent units of distance measurement across different regions, bringing standardization to the scientific community.
Current Use: Kilometers are widely used in most countries for measuring road distances, running races (e.g., 5K and 10K races), and geographical measurements. It remains the primary unit for long distances in metric countries.
Petameter (Pm)
Definition: A petameter (Pm) is a unit of length equal to 10^15 meters, used for measuring large cosmic distances such as the size of galaxies and nebulae.
History: The petameter was introduced to simplify extremely large measurements in astronomy, allowing researchers to express vast distances in a comprehensible unit.
Current Use: Petameters are used in astrophysics when discussing galaxy clusters, intergalactic distances, and space phenomena on an enormous scale.
Quick Conversion Table Kilometer (km) to Petameter (Pm)
1 Kilometer (km) equal to 1.0e-12 Petameter (Pm)
5 Kilometer (km) equal to 5.0e-12 Petameter (Pm)
10 Kilometer (km) equal to 1.0e-11 Petameter (Pm)
20 Kilometer (km) equal to 2.0e-11 Petameter (Pm)
30 Kilometer (km) equal to 3.0e-11 Petameter (Pm)
50 Kilometer (km) equal to 5.0e-11 Petameter (Pm)
75 Kilometer (km) equal to 7.50e-11 Petameter (Pm)
100 Kilometer (km) equal to 1.0e-10 Petameter (Pm)