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Sea level.
Oil level and oil pressure are different. You don't need to have full oil to get normal pressure.
Atmospheric pressure is measured by a barometer and expressed in millibars. Normal atmospheric pressure at sea level is 1013 millibars.
120/80 mmHg
When determining the blood oxygen level, doctors look for levels in the normal range. A normal arterial blood oxygen level is generally between 75 and 100 mmHg.
40 mmHg
no
A city water hookup should be around 60psi.
Oil pressure has to built up. As long as the pressure is normal and the oil level is good. There is no problem.
It can do. Winds in the atmosphere cause waves. Also the low pressure in the centre of a depression can cause a elevation in sea level called a storm surge.
Yes
The normal partial pressure of oxygen in arterial blood is 75-100 millimeters of mercury. In comparison the partial pressure of oxygen at sea level is 750 millimeters of mercury.