以下のような説明もあるようですね。
"A specification is a document that specifies a system or product, e.g. a prime-item development specification for an F-14. There are lots of sections/content in a spec: requirements, definitions, reference documents, glossary, verification information, etc.
A requirement is a single statement of something the product or system must do. A spec may have hundreds of requirements in it. Old school methodology says the requirement statement must use the word "shall", to separate requirements from statements of facts, or definitions. (Not sure if the new-fangled agile kids keep to all this or not; the fastidiousness has it's use but is a little fussy at times.)
So a spec is a document full of requirements, plus some other supporting and ancillary information."
Dimensions
- AirPods (each): 0.65 by 0.71 by 1.59 inches (16.5 by 18.0 by 40.5 mm)
- Charging Case: 1.74 by 0.84 by 2.11 inches (44.3 by 21.3 by 53.5 mm)