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- Leiden_scale abstract "The Leiden scale was used to calibrate low-temperature indirect measurements in the early twentieth century, by providing conventional values (in kelvins, then termed "degrees Kelvin") of helium vapour pressure. It was used below -183°C, the starting point of the International Temperature scale in the 1930s (Awbery 1934).It probably goes back to around 1894, when Heike Kamerlingh Onnes' cryogenic laboratory was established in Leiden, Netherlands.It has been reported that the scale is the kelvin scale shifted so that the boiling points of hydrogen and oxygen become zero and 70 respectively, but this is unlikely to be true. Oxygen under a standard atmosphere boils at a temperature in the 90.15 to 90.18 K range. For hydrogen, it depends on the molecular variety. The boiling point is 20.390 K for "normal" hydrogen (made up of 75% orthohydrogen and 25% parahydrogen) and 20.268 K for pure parahydrogen. Under the purported definition, absolute zero would lie at -20.15 °L.".
- Leiden_scale wikiPageExternalLink rpv1i1p161.pdf.
- Leiden_scale wikiPageExternalLink p70_1.
- Leiden_scale wikiPageExternalLink p89_1.
- Leiden_scale wikiPageExternalLink 308.
- Leiden_scale wikiPageID "997690".
- Leiden_scale wikiPageRevisionID "573041262".
- Leiden_scale hasPhotoCollection Leiden_scale.
- Leiden_scale subject Category:Obsolete_units_of_measurement.
- Leiden_scale subject Category:Units_of_temperature.
- Leiden_scale type Abstraction100002137.
- Leiden_scale type DefiniteQuantity113576101.
- Leiden_scale type Measure100033615.
- Leiden_scale type ObsoleteUnitsOfMeasure.
- Leiden_scale type UnitOfMeasurement113583724.
- Leiden_scale type UnitsOfTemperature.
- Leiden_scale comment "The Leiden scale was used to calibrate low-temperature indirect measurements in the early twentieth century, by providing conventional values (in kelvins, then termed "degrees Kelvin") of helium vapour pressure.".
- Leiden_scale label "Escala Leiden".
- Leiden_scale label "Leiden scale".
- Leiden_scale label "Échelle Leyden".
- Leiden_scale label "Лейденский градус".
- Leiden_scale sameAs Escala_Leiden.
- Leiden_scale sameAs Échelle_Leyden.
- Leiden_scale sameAs Skala_Leiden.
- Leiden_scale sameAs m.03xwmn.
- Leiden_scale sameAs Q621989.
- Leiden_scale sameAs Q621989.
- Leiden_scale sameAs Leiden_scale.
- Leiden_scale wasDerivedFrom Leiden_scale?oldid=573041262.
- Leiden_scale isPrimaryTopicOf Leiden_scale.