Growths on the surface of the eye can be unsightly and frightening. Most growths on the eye, which often occur as people age, pose no threat to health or vision and aren&rsquo;t cancers.
The unit of measure for static pressure is often inches of water (in. water). one inch of water is the suction needed to draw water up a straw one inch. pound per square inch static pressure (1 psi) is equal to 27.7 in. water static pressure. static pressure is given as Pascals (Pa).
what you mean is gage pressure, which refers to the pressure difference to a reference pressure. In most cases the gage is open to atmosphere. so you reference pressure is 1 atm (or 14.7 psi). so if your gage pressure is - 1 psi, you have 13.7 psi actual pressure. Negative to atmosphere.