femtometre

Directory

References

Discover

July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.

Will Light-Speed Space Travel Ever Be Possible?

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)

The Seven Sacraments of the Roman Catholic church

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

New Zealand. Political/Physical map. Includes locator.

Where Is “Old Zealand”?

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

femtometre

unit of measurement

Also known as: fm

Learn about this topic in these articles:

description and use

In atom: Atomic model
…measuring nuclear sizes is the femtometre (fm), which equals 10⁻¹⁵ metre. The diameter of a nucleus depends on the number of particles it contains and ranges from about 4 fm for a light nucleus such as carbon to 15 fm for a heavy nucleus such as lead. In spite of…
Read More