| helium temperature scale | has approval date 1958 |  |
| has definition The vapour pressure of helium 4 is used as an indication of temperature in the region 1 to 5.2 K. |  |
| is an instance of temperature unit |  |
| temperature unit | is a unit of temperature |  |
| has triple point of water -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall |  |
| has absolute zero -has source: Jerrard, H.G., McNeill, D.B. 1992 Dictionary of Scientific Units, Chapman and Hall |  |
| unit | has historical origin |  |
| represents |  |