# Pressure

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**Pressure** is the force per unit area applied on a surface. **Fluid pressure** is the pressure at some point within a fluid environment (liquid or gaseous). If the fluid is not moving quickly, then the term is **hydrostatic pressure** for liquids, and **barometric pressure** for gases. If the gas pressure being measured is the air on a planet – or in an artificial environment – then the term may be more specifically **atmospheric pressure**.

## Units of measurement

## Comparative list of pressures

- 464 atm, 470 bar, 47 MPa, 6.8×10
^{3}psi – Harry Kim counted**47 megapascals**on his way to engineering. (VOY: "Twisted")

- 4.93 atm, 5,000 mbar, 500 kPa, 72.5 psi – Capped deuterium well heads are under
**5,000 millibars**of pressure. (ENT: "Marauders")

- 1.02 atm, 1,033 mbar, 103.3 kPa, 14.9 psi – The internal pressure aboard a Borg cube is
**two kilopascals**above what would be normal on a Federation starship. (*Star Trek: First Contact*)

- 1 atm, 1,013 mbar, 101.3 kPa, 14.7 psi – The atmospheric pressure of the habitats aboard the Nyrian biosphere vessel, encountered by USS
*Voyager*in 2373, were kept at 1 atm. (VOY: "Displaced")

- 0.89 atm, 900 mbar, 90 kPa, 13.1 psi – The pressure encountered from the leading edge of shock waves encountered by USS
*Voyager*following the explosion of a supernova were over**90 kilopascals**– more than 30% higher than predicted. (VOY: "The Q and the Grey")

- 0.790 atm, 800 mbar, 80 kPa, 11.6 psi – The atmosphere at the surface of an unnamed planet which was home to a species of rock creatures was recorded at
**800 millibars**. (TAS: "Mudd's Passion")

- 0.75 atm, 758 mbar, 75.8 kPa, 11 psi – After the USS
*Constellation*was attacked by the "planet killer", the atmospheric pressure on the ship was measured at eleven pounds per square inch. (TOS: "The Doomsday Machine")

- 0.691 atm, 700 mbar, 70 kPa, 10.2 psi – While traveling to orbit in an mag-lev carriage, Neelix noted that while at an altitude of 800 meters, the carriage was traveling at a velocity thirty of kilometers per hour and the internal atmospheric pressure was at
**700 millibars**. (VOY: "Rise")

- 0.21 atm, 210 mbar, 21 kPa, 3.0 psi

0.25 atm, 250 mbar, 25 kPa, 3.6 psi – Warp core pressures aboard Starfleet ships are measured in kilopascals. Upon being pulled into the Delta Quadrant,*Voyager*'s warp core pressure was down to**21 kilopascals**. Upon unlocking the magnetic interlocks, they were able to increase it to a stable rate of**25 kilopascals**. (VOY: "Caretaker")

- 0.113 atm, 114 mbar, 11.4 kPa, 1.7 psi

0.092 atm, 93 mbar, 9.3 kPa, 1.3 psi – The computer warned Tom Paris that his space suit was leaking, informing him that the oxygen level was dropping from**114 millibars**to**93 millibars**before B'Elanna Torres connected to his suit to share her oxygen. (VOY: "Day of Honor")

- 0.103 atm, 104 mbar, 10.4 kPa, 1.5 psi

0.086 atm, 87 mbar, 8.7 kPa, 1.3 psi

0.070 atm, 71 mbar, 7.1 kPa, 1.0 psi – While Paris and Torres shared their oxygen, the level dropped from**104 millibars**, to**87 millibars**, and finally to**71 millibars**, before they were rescued by*Voyager*. (VOY: "Day of Honor")

### See also

- Blood pressure
- Hydrostatic system
- Neuro-pressure
- Osmotic pressure therapy
- Osteopathic pressure therapy
- Pressure chamber
- Pressure grenade