Round 13: Tossup 11

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 cells to achieve high values of this quantity, which has the same units as stress. (10[1])Longitudinal seismic waves are often named for this quantity and are contrasted with S-waves. This quantity appears on the y-axis of carbon’s phase diagram, explaining the conversion of graphite into diamond at high values of this quantity. This quantity equals force per unit area. For 10 points, what quantity can be measured in Pascals or atmospheres? ■END■ (10[1])

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