poundal
Sign in to saveAlso known as pdl, lb ft/s²
The poundal (symbol: pdl) is a unit of force, introduced in 1877, that is part of the Absolute English system of units, which itself is a coherent subsystem of the foot–pound–second system.
Key facts
- Unit.name
- poundal
- Unit.standard
- Absolute English System
- Unit.quantity
- Force
- Unit.symbol
- pdl
- Unit.units1
- AE base units
- Unit.inunits1
- 1 lb⋅ft/s2
- Unit.units2
- SI units
- Unit.units3
- CGS units
- Unit.units4
- British Gravitational System
via Wikipedia infobox
Wikidata facts
Show 3 more facts
- conversion to SI unit
- 0.138254954376
- unit symbol
- باوندال
- Wikidata SPARQL query equivalent
- wd:Q1972579 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
Sources (1)
via Wikidata · CC0
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Article
4 sectionsContents
- Background
- Conversion
- See also
- References
The poundal (symbol: pdl) is a unit of force, introduced in 1877, that is part of the Absolute English system of units, which itself is a coherent subsystem of the foot–pound–second system. 1\,\text{pdl} = 1\,\text{lb}{\cdot}\text{ft}/\text{s}^2 The poundal is defined as the force necessary to accelerate 1 pound-mass at 1 foot per second squared. 1 pdl = exactly.
== Background == English units require re-scaling of either force or mass to eliminate a numerical proportionality constant in the equation F = ma. The poundal represents one choice, which is to rescale units of force. Since a pound of force (pound force) accelerates a pound of mass (pound mass) at 32.174 049 ft/s2 (9.80665 m/s2; the acceleration of gravity, g), we can scale down the unit of force to compensate, giving us one that accelerates 1 pound mass at 1 ft/s2 rather than at 32.174 049 ft/s2; and that is the poundal, which is approximately pound force.