Length

Deutsch: Unter einem Längenmaß oder genauer einer Längenmaßeinheit versteht man eine Maßeinheit für die Länge.

English: Length refers to the longest dimension of an object, or in certain contexts, a certain dimension of an object.

Main category: Length

Arc length

Main category: Arc length

• 
  arc-length approximation by multiple linear segments
• 
  arc length of a small piece of curve approximated with the Pythagorean theorem
• 
  Fermat's method

Length measuring devices

Main category: Length measuring devices

• 
  Messschieber/Vernier caliper
• 
  Dial indicator
• 
  Limit gauges
• 
  length calibration blocks
• 
  Interferometer diagram
• 
  Precision interferometer
• 
  Vernier caliper parts diagram
• 
  Micrometer caliper parts diagram
• 
  Measuring wheel
• 
  Opisometer
• 
  Retractable tape measure
• 
  Ruler icon
• 
  Architectural scale ruler

Units of length

Main category: Units of length

• 
  Imperial measurement standards at Greenwich
• 
  Metre compared to the Toscana Doppiabraccio measure
• 
  Chinese Cun variant 3
• 
  Hand span
• 
  Deutsch: Ruthe, Klafter, Elle und Schuh
• 
  Parsec used in astronomy

Orders of magnitude (length)

English: Orders of magnitude (length)

• 
  proton at the femtometre scale: 1e-15m
• 
  hydrogen atom at the Angstrom or tens of picometres scale: 1e-11m
• 
  Example lengths from 1e-6m to 1e5m
• 
  Example lengths from 1e6m to 1e17m
• 
  Typical spider silk at the micrometre scale: 1e-6m
• 
  Human body at the metre scale: 1e0m
• 
  Moons and planets at the megametre scale: 1e6m
• 
  stars at the 100 gigametres scale: 1e11m
• 
  1e15m or one light year
• 
  1e16m or ten light years
• 
  1e17m or 100 light years