# ITS-90 4He vapour pressure equation coefficients (2.1768 K to 5.0 K)
Coefficient	Value
A0	3.146631
A1	1.357655
A2	0.413923
A3	0.091159
A4	0.016349
A5	0.001826
A6	-0.004325
A7	-0.004973
A8	0.0
A9	0.0
B	10.3
C	1.9