Units of Pressure - Maple Programming Help

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Units of Pressure

 

Description

Examples

Description

• 

Pressure (or stress) has the dimension mass per length time squared. The SI unit of pressure is the pascal, which is defined as a newton per square meter, or a kilogram per meter second squared.

• 

Maple knows the units of pressure listed in the following table.

Name

Symbols

Context

Alternate Spellings

Prefixes

 

 

 

 

 

bar

bar

SI *

bars

SI

 

 

 

 

 

atmosphere

atm @, atmos@

standard *

atmospheres

 

 

at @

technical

 

 

 

 

 

 

 

barye

 

standard *

baryes

SI

pieze

 

standard *

piezes

SI

torr

Torr

standard *

torrs

SI

vac

 

standard *

vacs

SI

pound_per_square_inch

psi

standard *

pounds_per_square_inch

 

 

 

 

 

 

meter_mercury

mHg

standard *

meters_mercury, metre_mercury, metres_mercury

SI

 

 

`0degC`

 

SI

foot_mercury

ftHg

standard *

feet_mercury

 

 

 

`32degF`

 

 

 

 

`60degF`

 

 

inch_mercury

inHg

standard *

inches_mercury

 

 

 

`32degF`

 

 

 

 

`60degF`

 

 

 

 

 

 

 

meter_water

mH2O

standard *

meters_water, metre_water, metres_water

SI

 

 

`4degC`

 

SI

foot_water

ftH2O

standard *

feet_water

 

 

 

`39.2degF`

 

 

inch_water

inH2O

standard *

inches_water

 

 

 

`39.2degF`

 

 

kipf_per_square_inch

ksi

standard

 

 

pascal

Pa

SI

pascals

 

planck_pressure

 

planck *

planck_pressures

 

  

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, pascal[SI] or mmHg[standard]; by using an abbreviation, for example, at; or, if the context is indicated as the default, by using only the unit name or symbol, for example, pascal or mmHg.

  

 

  

The units of pressure are defined as follows.

  

A bar is defined as 100000 pascals.

  

A standard atmosphere is defined as 101325 pascals.

  

A technical atmosphere is defined as a kilogramforce per square centimeter, that is, 98066.5 pascals.

  

A barye is defined as a dyne per square centimeter.

  

A pieze is defined as a sthene per square meter.

  

A torr is defined as 1760 standard atmosphere.

  

A vac is defined as a millibar.

  

A pound per square inch is defined as a poundforce per inch squared.

  

A planck pressure is defined as a planck mass per planck length per planck time squared.

Mercury

• 

The meter, foot, and inch of mercury are the pressures exerted by columns of mercury 1 meter, foot, and inch in height, respectively.

  

A standard meter of mercury is defined as 2519 atmospheres.

  

A 0 degree Celsius meter of mercury is defined as approximately 133322 pascals.

  

A standard foot of mercury is defined as 0.3048 standard meter of mercury.

  

A 32 degree Fahrenheit foot of mercury is defined as approximately 40636.6 pascals.

  

A 60 degree Fahrenheit foot of mercury is defined as approximately 40522.2 pascals.

  

A standard inch of mercury is defined as 0.0254 standard meter of mercury.

  

A 32 degree Fahrenheit inch of mercury is defined as approximately 3386.38 pascals.

  

A 60 degree Fahrenheit inch of mercury is defined as approximately 3376.85 pascals.

Water

• 

The meter, foot, and inch of water are the pressures exerted by columns of water 1 meter, foot, and inch in height, respectively.

  

A standard meter of water is defined as the pressure exerted by 1000 kilograms per square meter assuming standard acceleration of free fall.

  

A 4 degrees Celsius meter of water is defined as approximately 9806.38 pascals.

  

A standard foot of water is defined as 0.3048 standard meter of water.

  

A 39.2 degree Fahrenheit foot of water is defined as approximately 2988.98 pascals.

  

A standard inch of water is defined as 0.0254 standard meter of water.

  

A 39.2 degree Fahrenheit inch of water is defined as approximately 249.082 pascals.

Examples

convertPa,dimensions,base=true

masslengthtime2

(1)

convert42.0,units,inHg,mmHg

1066.800000

(2)

convert1.0,units,inHg`32degF`,inH2O`39.2degF`

13.59544246

(3)

convert1.0,units,at,atm

0.9678411054

(4)

convert1.231,units,bar,atmosphere

1.214902541

(5)

convert34.21,units,pieze,torr

256.5961017

(6)

See Also

convert/dimensions

convert/units

Units

Units/force

Units/Index

Units/length

Units/mass

Units/time