pressure - Maple Help

Units of Pressure

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 $\frac{1}{760}$ 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 $\frac{25}{19}$ 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

 > $\mathrm{convert}\left('\mathrm{Pa}','\mathrm{dimensions}','\mathrm{base}'=\mathrm{true}\right)$
 $\frac{{\mathrm{mass}}}{{\mathrm{length}}{}{{\mathrm{time}}}^{{2}}}$ (1)
 > $\mathrm{convert}\left(42.0,'\mathrm{units}','\mathrm{inHg}','\mathrm{mmHg}'\right)$
 ${1066.800000}$ (2)
 > $\mathrm{convert}\left(1.0,'\mathrm{units}','\mathrm{inHg}\left[\mathrm{32degF}\right]','\mathrm{inH2O}\left[\mathrm{39.2degF}\right]'\right)$
 ${13.59544246}$ (3)
 > $\mathrm{convert}\left(1.0,'\mathrm{units}','\mathrm{at}','\mathrm{atm}'\right)$
 ${0.9678411054}$ (4)
 > $\mathrm{convert}\left(1.231,'\mathrm{units}','\mathrm{bar}','\mathrm{atmosphere}'\right)$
 ${1.214902541}$ (5)
 > $\mathrm{convert}\left(34.21,'\mathrm{units}','\mathrm{pieze}','\mathrm{torr}'\right)$
 ${256.5961017}$ (6)