| Abstract: | An investigation of the thermomagnetic torque, or Scott effect, has been carried out in several concentrations of ortho and para-hydrogen. Measurements were made with a sensitive torsion pendulum over a range of temperatures from 80 K to 380 K with pressures from 0.035 to 1.50 torr. The measured torques are dependent on magnetic field and on pressure in general agreement with the phenomenological theory of Levi and Beenakker. At room temperature, pure para-hydrogen produces a very much larger torque than ortho-hydrogen. In all concentrations of ortho and para-hydrogen studied, the maximum of torque multiplied by pressure as a function of field divided by pressure occurs at H/P = 50 oersteds/torr. In pure para-hydrogen the torque was found to approach zero s the temperature fell below 100 K. |
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