Discussion
Which of the following is not the unit of pressure ?
Answer: D
The one that is not a unit of pressure is the newton.
The newton is the SI unit of force (1 N = 1 kg m s-2). Pressure is force per unit area, measured in pascal (N m-2).
The other four all measure pressure: the standard atmosphere (1 atm = 101325 Pa), the bar (105 Pa), the torr and the millimetre of mercury (each about 133.3 Pa, and equal to each other to within a tiny fraction).
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