Tossup

In statics, this quantity equals negative one-third times the trace of the Cauchy stress tensor. Solids don’t collapse under electric force due to a form of this quantity caused by the Pauli exclusion principle. (-5[1])Laboratories can use diamond anvil (10[1])cells to achieve high values of this quantity, (10[1])which has the same units as stress. (10[1])Longitudinal (-5[1])seismic waves are often named for this quantity and are contrasted with S-waves. This quantity (10[1])appears on the y-axis of carbon’s (10[1]-5[1])phase diagram, explaining the conversion of graphite into diamond at high (10[1])values of this quantity. (10[1])This quantity equals force per unit area. For 10 points, what quantity can be measured in Pascals or atmospheres? ■END■ (10[3])

ANSWER: pressure [accept quantum degeneracy pressure; accept pressure waves; prompt on P or P-waves]
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