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The fractional frequency shift in the nmr signal from protons in a spherically-shaped pure water sample has been measured directly as -10.36(30) × 10-9 °C-1 over the range 5 °C to 45 °C. A revised value of 25.69(14) × 10-6 is suggested for the proton diamagnetic shielding correction in water at 25 °C, leading to μ'p(25 °C)/μB = 0.001 520 993 136(17).
Petley et al. (Sun,) studied this question.