Orders of magnitude (pressure)

20 µPa	Threshold of human hearing. Air pressure oscillations of this amplitude, at frequencies between 1 and 5 kHz, are the smallest the ear can hear in a noiseless environment.
0.5 Pa	Atmospheric pressure on Pluto (1988 figure; very roughly).
1 Pa	Pressure exerted by a house fly standing on a postage stamp (roughly).
10 Pa	Pressure increase per millimeter of a water column (roughly).¹
1 kPa	Atmospheric pressure on Mars; ∼1 % of atmospheric sea-level pressure on Earth.
10 kPa	Pressure increase per meter of a water column¹, or the drop in air pressure when going from earth sea level to 1000 m elevation.
101.325 kPa	Standard atmospheric pressure for earth sea level = 1013.25 hPa.
180 to 250 kPa	Pressure in an automobile tire.
0.8 to 2 MPa	Pressure used in boilers of steam locomotives.
10 MPa	Pressure washers force out water at this pressure.
100 MPa	Pressure at bottom of Mariana Trench, about 10 km below ocean surface.
10 GPa	Pressure at which diamond forms.
100 GPa	Theoretical tensile strength of a carbon nanotube (CNT).

¹ At earth mean sea level.