The above form works if you are measuring differential The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units.

Poundal/square foot , Ton-force (long)/square inch , (The term fluid refers to both liquids and gases – for more information specifically about liquid pressure, see section below.). short ton-force and long ton-force per square inch, fsw (feet sea water) used in underwater diving, particularly in connection with diving pressure exposure and, msw (metres sea water), used in underwater diving, particularly in connection with diving pressure exposure and, kilogram-force, or kilopond, per square centimetre (. Standard atmosphere (atm) , centimeter , When a liquid presses against a surface, there is a net force that is perpendicular to the surface. Fluid pressure occurs in one of two situations: Pressure in open conditions usually can be approximated as the pressure in "static" or non-moving conditions (even in the ocean where there are waves and currents), because the motions create only negligible changes in the pressure. Examples include mm, the ocean, a swimming pool, or the atmosphere.

p Millibar (mbar) , Differential pressure is expressed in units with "d" appended; this type of measurement is useful when considering sealing performance or whether a valve will open or close. Since atmospheric pressure at sea level is about 100 kPa (14.7 psi), the absolute pressure in the tire is therefore about 320 kPa (46 psi).

In non-SI technical work, a gauge pressure of 32 psi (220 kPa) is sometimes written as "32 psig", and an absolute pressure as "32 psia", though the other methods explained above that avoid attaching characters to the unit of pressure are preferred.[7].

The concepts of fluid pressure are predominantly attributed to the discoveries of Blaise Pascal and Daniel Bernoulli. Use this page to learn how to convert between bars and pounds/square inch. Millipascal (mPa) , and shares many similar properties with three-dimensional pressure. The most common choices are mercury (Hg) and water; water is nontoxic and readily available, while mercury's high density allows a shorter column (and so a smaller manometer) to be used to measure a given pressure.

assuming you are measuring psia, which is the pressure relative When a person swims under the water, water pressure is felt acting on the person's eardrums. It is approximately equal to typical air pressure at Earth mean sea level and is defined as 101325 Pa. Because pressure is commonly measured by its ability to displace a column of liquid in a manometer, pressures are often expressed as a depth of a particular fluid (e.g., centimetres of water, millimetres of mercury or inches of mercury). Another example is a knife. Such conditions conform with principles of fluid statics. [17] This is the same speed the water (or anything else) would have if freely falling the same vertical distance h. is the kinematic pressure, where Oceanographers usually measure underwater pressure in decibars (dbar) because pressure in the ocean increases by approximately one decibar per metre depth. Pound-force/square foot , Properties of surface chemicals can be investigated by measuring pressure/area isotherms, as the two-dimensional analog of Boyle's law, πA = k, at constant temperature. F History/origin: Pound-force per square inch is a unit that originated in the imperial and US customary systems of units. bar or Because a liquid can flow, this pressure isn't only downward. Liquids are practically incompressible – that is, their volume can hardly be changed by pressure (water volume decreases by only 50 millionths of its original volume for each atmospheric increase in pressure). Psi (psi) , We can shrink the size of our "container" down to a very small point (becoming less true as we approach the atomic scale), and the pressure will still have a single value at that point. inch = 13789514.586338 Pascal [Pa], 1 Ton-force (long)/square foot = 107251.78011595 Pascal [Pa], 1 Ton-force (long)/square inch = 15444256.336697 Pascal [Pa], 1 Kip-force/square inch = 6894757.2931783 Pascal [Pa], 1 Pound-force/square foot = 47.880258980405 Pascal [Pa], 1 Pound-force/square inch = 6894.7572931783 Pascal [Pa], 1 Poundal/square foot = 1.4881639435695 Pascal [Pa], 1 Torr [Torr] = 133.32236842108 Pascal [Pa], 1 Centimeter mercury (0°C) = 1333.22 Pascal [Pa], 1 Millimeter mercury (0°C) = 133.322 Pascal [Pa], 1 Inch mercury (32°F) [inHg] = 3386.3800000001 Pascal [Pa], 1 Inch mercury (60°F) [inHg] = 3376.85 Pascal [Pa], 1 Centimeter water (4°C) = 98.063800000001 Pascal [Pa], 1 Millimeter water (4°C) = 9.8063800000001 Pascal [Pa], 1 Inch water (4°C) [inAq] = 249.082 Pascal [Pa], 1 Foot water (4°C) [ftAq] = 2988.98 Pascal [Pa], 1 Inch water (60°F) [inAq] = 248.843 Pascal [Pa], 1 Foot water (60°F) [ftAq] = 2986.116 Pascal [Pa], 1 Atmosphere technical [at] = 98066.500000003 Pascal [Pa]. This tensor may be expressed as the sum of the viscous stress tensor minus the hydrostatic pressure.

You can find metric conversion tables for SI units, as well bar to petabar

The standard atmosphere (atm) is an established constant. Fluid density and local gravity can vary from one reading to another depending on local factors, so the height of a fluid column does not define pressure precisely. Inch water (4°C) (inAq) , In technical work, this is written "a gauge pressure of 220 kPa (32 psi)". Mathematically: Some meteorologists prefer the hectopascal (hPa) for atmospheric air pressure, which is equivalent to the older unit millibar (mbar).

A closed condition, called "closed conduit", e.g.

At the surface, gravitational potential energy is large but liquid pressure energy is low. Atmosphere technical (at) , © 2015, Converterr.com , All rights reserved, You contribution is vital for our project. The pressure due to a liquid in liquid columns of constant density or at a depth within a substance is represented by the following formula: Another way of saying the same formula is the following: where the volume of the column is simply the area multiplied by the depth. vector area {\displaystyle \scriptstyle {\sqrt {2gh}}} pressure, such as the difference in psi between two points. Although the force applied to the surface is the same, the thumbtack applies more pressure because the point concentrates that force into a smaller area. The pressure in closed conditions conforms with the principles of fluid dynamics. 1 bar= 10^5N / m^2. {\displaystyle p} However, the US National Institute of Standards and Technology recommends that, to avoid confusion, any modifiers be instead applied to the quantity being measured rather than the unit of measure. Although pressure doesn't have a specific direction, force does. as English units, currency, and other data. A Or, if the liquid is two or three times as dense, the liquid pressure is correspondingly two or three times as great for any given depth. With any incremental increase in that temperature, the vapor pressure becomes sufficient to overcome atmospheric pressure and lift the liquid to form vapour bubbles inside the bulk of the substance. Inch water (60°F) (inAq) , Femtopascal (fPa) , In an ideal gas, molecules have no volume and do not interact.