Lambda (written λ, in lowercase) is a non-SI unit of volume equal to 10−9 m3, 1 cubic millimetre (mm3) or 1 microlitre (μL). Introduced by the BIPM in 1880,[1] the lambda has been used in chemistry[2] and in law for measuring volume, but its use is not recommended.[3]
| lambda | |
|---|---|
| Unit system | Non-SI metric unit |
| Unit of | Volume |
| Symbol | λ |
| Conversions | |
| 1 λ in ... | ... is equal to ... |
| SI base units | 10−9 m3 |
| Units accepted for use with SI | 1 μL |
This use of λ parallels the pre-SI use of μ on its own for a micrometre and γ for a microgram.[4][5] Although the use of λ is deprecated, some clinical laboratories continue to use it.[6] The standard abbreviation μL for a microlitre has the disadvantage that it can be misread as mL (a unit 1000 times larger). In pharmaceutical use, no abbreviation for a microlitre is considered safe. The recommended practice is to write "microlitre" in full.[7]
References
edit- ^ Donald Fenna (2002), A Dictionary of Weights, Measures, and Units, Oxford University Press, ISBN 0198605226, p. 153.
- ^ "Units: L". University of North Carolina. Retrieved 2015-03-28.
- ^ Carl A. Burtis and David E. BrunsTietz (2014), Fundamentals of Clinical Chemistry and Molecular Diagnostics, 7th ed., Elsevier Health Sciences, ISBN 0323292062, p. 114.
- ^ Lela Buckingham (2014), Fundamental Laboratory Mathematics: Required Calculations for the Medical Laboratory Professional, F. A. Davis, ISBN 0803641028, p. 48.
- ^ I. P. Alimarin and M. N. Petrikova (2013), Inorganic Ultramicroanalysis, Elsevier, ISBN 1483150488, p. xiv.
- ^ Barbara H. Estridge, Anna P. Reynolds, and Norma J. Walters (2000), Basic Medical Laboratory Techniques, 4th ed., Cengage Learning, ISBN 0766812065, p. 32.
- ^ Chris Langley and Yvonne Perrie (2014), Maths Skills for Pharmacy: Unlocking Pharmaceutical Calculations, Oxford University Press, ISBN 019968071X, p. 55.
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