This-special-name-for-the-unit-was-added-in-1971 -- Multiple sentences match

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This special name for the unit was added in 1971 ; before that, pressure in SI was expressed in units such as N · m < sup >− 2 </ sup >.

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This special name for the unit was added in 1971 ; before that, pressure in SI was expressed simply as N / m < sup > 2 </ sup >.

0.008 seconds.

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