Meanings
alternative Armstrong's line
- The altitude above sea level at which water boils without a pressurized environment, and at which a person would require a pressure suit or pressurized environment to survive, and avoid having their bodily fluids boil away.
Synonyms: Armstrong's line, Armstrong limit
Synonyms & antonyms
proper nounThe altitude above sea level at which water boils without a pressurized environment, and at which a person would require a pressure suit or pressurized environment to survive, and avoid having their bodily fluids boil away.
Origin
Named after Harry George Armstrong (1899–1983), who determined this limit.
Full word history & related roots →Translations
Portuguese linha de Armstrong
- linha de Armstrongaltitude at which water boils without a pressurized environment
Cite this entry
Armstrong line. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Armstrong%20line
“Armstrong line.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Armstrong%20line. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “Armstrong line,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Armstrong%20line.
Source: Armstrong line on Wiktionary, CC BY-SA 4.0.