Which of the following correctly represents the value of 1 bar?

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0.9869 atmospheresPressure exerted by a 1020 cm column of waterEquivalent to a 75.01 cm mercury columnAll the above are correctNone of the above

Explanation

One bar corresponds to multiple equivalent pressure measurements: approximately 0.9869 atm, the pressure from a 1020 cm water column, and the pressure from a 75.01 cm mercury column. Therefore, all the listed options accurately represent 1 bar.