Question 1

What length units exist?

Accepted Answer

Metric: mm, cm, m, km. Imperial: in, ft, yd, mi. Nautical: cables, fathoms, nautical miles. Scientific: angstroms, light-years, parsecs.

Question 2

Which length system should I use?

Accepted Answer

Metric for science and most countries. Imperial in US, UK, and Myanmar. Nautical for marine/aviation. Use the system your audience expects.

Question 3

What are the basic conversion factors?

Accepted Answer

1 in = 2.54 cm, 1 ft = 0.3048 m, 1 mi = 1.609 km, 1 nmi = 1.852 km. These are the key conversions to memorize.

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