Table 1 Molecular constants of hydrogen isotopes used in this paper20.

From: Speed of sound in hydrogen isotopes derived from the experimental pvt data and an improved quantum law of corresponding state

items

H2

D2

T2

M/(g/mol)

2.016

4.028

6.032

\((\varepsilon /k)/{\rm{K}}\)

36.7

35.2

34.5

σ/(10−10m)

2.959

2.952

2.949

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