Package org.djunits.quantity

Class Pressure.Unit

java.lang.Object

org.djunits.unit.AbstractUnit<Pressure.Unit,Pressure>

org.djunits.quantity.Pressure.Unit

All Implemented Interfaces:

UnitInterface<Pressure.Unit,Pressure>

Enclosing class:

Pressure

public static class Pressure.Unit
extends AbstractUnit<Pressure.Unit,Pressure>

Pressure.Unit encodes the units of force exerted per unit area.

Copyright (c) 2025-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

Field Summary

Fields

Modifier and Type	Field	Description
static final Pressure.Unit	at	technical atmosphere = kgf/cm2.
static final Pressure.Unit	atm	standard atmosphere.
static final Pressure.Unit	Ba	barye = dyne/cm2.
static final Pressure.Unit	bar	bar.
static final Pressure.Unit	cmHg	cm Hg.
static final Pressure.Unit	ftHg	foot Hg.
static final Pressure.Unit	hPa	hectopascal.
static final Pressure.Unit	inHg	inch Hg.
static final Pressure.Unit	kgf_mm2	kilogram-force per square millimeter.
static final Pressure.Unit	kPa	kilopascal.
static final Pressure.Unit	lbf_ft2	pound-force per square foot.
static final Pressure.Unit	lbf_in2	pound-force per square inch.
static final Pressure.Unit	mbar	millibar.
static final Pressure.Unit	mmHg	mm Hg.
static final Pressure.Unit	Pa	Pascal.
static final Pressure.Unit	psi	psi = pound-force per square inch.
static final Pressure.Unit	pz	pieze.
static final Pressure.Unit	SI	The SI or BASE unit.
static final SIUnit	SI_UNIT	The dimensions of pressure: kg/m.s2.
static final Pressure.Unit	torr	torr.

Constructor Summary

Constructors

Constructor	Description
Unit(String id, String name, double scaleFactorToBaseUnit, UnitSystem unitSystem)	Create a new Pressure unit.
Unit(String textualAbbreviation, String displayAbbreviation, String name, Scale scale, UnitSystem unitSystem)	Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Method Summary

Modifier and Type	Method	Description
Pressure.Unit	deriveUnit(String textualAbbreviation, String displayAbbreviation, String name, double scaleFactor, UnitSystem unitSystem)	Return a linearly scaled derived unit for this unit, with textual abbreviation(s) and a display abbreviation.
Pressure.Unit	getBaseUnit()	Return the base unit for this unit.
Pressure	ofSi(double si)	Return an SI-quantity for this unit with a value.
SIUnit	siUnit()	Return the SI unit for this unit.

Methods inherited from class org.djunits.unit.AbstractUnit

deriveUnit, equals, generateSiPrefixes, getDisplayAbbreviation, getId, getName, getScale, getSiPrefix, getStoredDisplayAbbreviation, getStoredName, getStoredTextualAbbreviation, getTextualAbbreviation, getUnitSystem, hashCode, setSiPrefix, setSiPrefix, setSiPrefixKilo, setSiPrefixPer, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.djunits.unit.UnitInterface

fromBaseValue, quantityInUnit, toBaseValue

Field Details

SI_UNIT

public static final SIUnit SI_UNIT

The dimensions of pressure: kg/m.s2.

Pa

public static final Pressure.Unit Pa

Pascal.

SI

public static final Pressure.Unit SI

The SI or BASE unit.

hPa

public static final Pressure.Unit hPa

hectopascal.

kPa

public static final Pressure.Unit kPa

kilopascal.

atm

public static final Pressure.Unit atm

standard atmosphere.

torr

public static final Pressure.Unit torr

torr.

at

public static final Pressure.Unit at

technical atmosphere = kgf/cm2.

Ba

public static final Pressure.Unit Ba

barye = dyne/cm2.

bar

public static final Pressure.Unit bar

bar.

mbar

public static final Pressure.Unit mbar

millibar.

cmHg

public static final Pressure.Unit cmHg

cm Hg.

mmHg

public static final Pressure.Unit mmHg

mm Hg.

ftHg

public static final Pressure.Unit ftHg

foot Hg.

inHg

public static final Pressure.Unit inHg

inch Hg.

kgf_mm2

public static final Pressure.Unit kgf_mm2

kilogram-force per square millimeter.

lbf_ft2

public static final Pressure.Unit lbf_ft2

pound-force per square foot.

lbf_in2

public static final Pressure.Unit lbf_in2

pound-force per square inch.

psi

public static final Pressure.Unit psi

psi = pound-force per square inch.

pz

public static final Pressure.Unit pz

pieze.

Constructor Details

Unit

public Unit(String id,
 String name,
 double scaleFactorToBaseUnit,
 UnitSystem unitSystem)

Create a new Pressure unit.

Parameters:

id - the id or main abbreviation of the unit

name - the full name of the unit

scaleFactorToBaseUnit - the scale factor of the unit to convert it TO the base (SI) unit

unitSystem - the unit system such as SI or IMPERIAL

Unit

public Unit(String textualAbbreviation,
 String displayAbbreviation,
 String name,
 Scale scale,
 UnitSystem unitSystem)

Return a derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Parameters:

textualAbbreviation - the textual abbreviation of the unit, which doubles as the id

displayAbbreviation - the display abbreviation of the unit

name - the full name of the unit

scale - the scale to use to convert between this unit and the standard (e.g., SI, BASE) unit

unitSystem - unit system, e.g. SI or Imperial

Method Details

siUnit

public SIUnit siUnit()

Description copied from interface: UnitInterface

Return the SI unit for this unit.

Returns:

the SI unit for this unit

getBaseUnit

public Pressure.Unit getBaseUnit()

Description copied from interface: UnitInterface

Return the base unit for this unit.

Returns:

the base unit for this unit

ofSi

public Pressure ofSi(double si)

Description copied from interface: UnitInterface

Return an SI-quantity for this unit with a value.

Parameters:

si - the value in SI or BASE units

Returns:

an SI-quantity for this unit with the given si-value

deriveUnit

public Pressure.Unit deriveUnit(String textualAbbreviation,
 String displayAbbreviation,
 String name,
 double scaleFactor,
 UnitSystem unitSystem)

Description copied from class: AbstractUnit

Return a linearly scaled derived unit for this unit, with textual abbreviation(s) and a display abbreviation.

Specified by:

deriveUnit in class AbstractUnit<Pressure.Unit,Pressure>

Parameters:

textualAbbreviation - the textual abbreviation of the unit, which doubles as the id

displayAbbreviation - the display abbreviation of the unit

name - the full name of the unit

scaleFactor - the (linear) scale factor to multiply with the current (linear) scale factor

unitSystem - unit system, e.g. SI or Imperial

Returns:

a derived unit for this unit