| 21. | The surface pressure turned out to be.
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| 22. | The resulting mean surface pressure is only 0.6 % of that of Earth ( 101.3 kPa ).
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| 23. | Because these are dry-air mole fractions, these measurements do not change with water content or surface pressure.
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| 24. | While drilling the oil well, surface pressure control is provided by a blowout preventer ( BOP ).
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| 25. | The surface pressure will suddenly drop and the frac engineer will know that the fracture has started.
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| 26. | A sudden adjustment in the jet stream can lead to rapid rises and drops in surface pressure.
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| 27. | On Monday afternoon, reconnaissance aircraft investigating Roxanne found sustained winds of 60 mph and rapidly falling surface pressures.
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| 28. | Surface pressures varied diurnally over a 0.2 millibar range, but showed 2 daily minima and two daily maxima.
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| 29. | Rising surface pressure over the Northeast is associated with an expanding fair weather system moving southeast from Quebec.
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| 30. | But the planet exhibits a dense cloud layer miles above the surface, suggesting the surface pressure is pretty high.
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