At around 19 kilometers above sea level, the Armstrong line marks the boundary where water boils in an unpressurized environment and an unprotected person would need a pressure suit to avoid their bodily fluids boiling away.

The museum displayed several Armstrong guns from the 19th century alongside detailed diagrams.

The museum displayed an Armstrong gun that once defended the harbor.

The engineers tested several King-Armstrong units before approving the design.

The lab still documented the result in a King-Armstrong unit, an obsolete measure of alkaline phosphatase concentration.

During the field study, the geologist carefully collected a sample of armstrongite to analyze its crystal structure and chemical composition.

Her Armstrongian analysis of law and causation revived interest in robust metaphysical realism.