These liquids, which were originally created at NASA for use as rocket fuel, are now used to form namesake seals during chip manufacture. For 10 points each:
[10m] Name these colloids that can be made to form a regular pattern of spikes through Rosensweig or normal-field instability.
ANSWER: ferrofluids [or ferrofluidic materials]
[10e] As their name suggests, ferrofluids contain suspended particles made up of compounds of this metal, such as hematite.
ANSWER: iron [or Fe]
[10h] Ferrofluids with varying values of this quantity can lead to thermomagnetic convection. Ferrofluids have high values for this quantity that measures the magnetization induced by an applied magnetic field. The sign of this quantity indicates whether a material is paramagnetic or diamagnetic.
ANSWER: magnetic susceptibility [prompt on chi]
<Joseph Krol , Science - Physics - Electromagnetic>