Package org.djunits.quantity

Class Momentum

java.lang.Object

java.lang.Number

org.djunits.quantity.def.Quantity<Momentum>

org.djunits.quantity.Momentum

All Implemented Interfaces:

Serializable, Comparable<Momentum>, Additive<Momentum>, Scalable<Momentum>, Value<Momentum>

public class Momentum
extends Quantity<Momentum>

Momentum is the product of an object's mass and velocity, measured in kilogram meters per second (kgm/s).

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

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Momentum.Unit	Momentum.Unit encodes a unit for the product of an object's mass and velocity.

Field Summary

Fields

Modifier and Type	Field	Description
static final Momentum	NaN	Constant with value NaN.
static final Momentum	NEG_MAXVALUE	Constant with value -MAX_VALUE.
static final Momentum	NEGATIVE_INFINITY	Constant with value NEGATIVE_INFINITY.
static final Momentum	ONE	Constant with value one.
static final Momentum	POS_MAXVALUE	Constant with value MAX_VALUE.
static final Momentum	POSITIVE_INFINITY	Constant with value POSITIVE_INFINITY.
static final Momentum	ZERO	Constant with value zero.

Fields inherited from class org.djunits.quantity.def.Quantity

si

Constructor Summary

Constructors

Constructor	Description
Momentum(double valueInUnit, Momentum.Unit unit)	Instantiate a Momentum quantity expressed in the given unit.
Momentum(double value, Momentum.Unit displayUnit, boolean useSi)	Instantiate a Momentum quantity with an SI or base value and a display unit.

Method Summary

Modifier and Type	Method	Description
Length	divide(FlowMass v)	Calculate the division of Momentum and FlowMass, which results in a Length scalar.
FlowMass	divide(Length v)	Calculate the division of Momentum and Length, which results in a FlowMass scalar.
Speed	divide(Mass v)	Calculate the division of Momentum and Mass, which results in a Speed scalar.
Dimensionless	divide(Momentum v)	Calculate the division of Momentum and Momentum, which results in a Dimensionless quantity.
Mass	divide(Speed v)	Calculate the division of Momentum and Speed, which results in a Mass scalar.
Momentum.Unit	getDisplayUnit()	Retrieve the unit of this Value.
Momentum	instantiateSi(double siValue, UnitInterface<Momentum> displayUnit)	Instantiate a quantity with an SI or base value, and a display unit.
Power	multiply(Acceleration v)	Calculate the multiplication of Momentum and Acceleration, which results in a Power scalar.
Energy	multiply(Speed v)	Calculate the multiplication of Momentum and Speed, which results in a Energy scalar.
static Momentum	of(double valueInUnit, String unitString)	Returns a Momentum based on a value and the textual representation of the unit, which can be localized.
static Momentum	of(double valueInUnit, Momentum.Unit unit)	Returns a Momentum based on a value expressed in the unit.
static Momentum	ofSi(double si)	Return a Momentum instance based on an SI value.
static Momentum	ofSi(double siValue, Momentum.Unit displayUnit)	Instantiate a Momentum quantity with an SI or base value and a display unit.
static Momentum	valueOf(String text)	Returns a Momentum representation of a textual representation of a value with a unit.

Methods inherited from class org.djunits.quantity.def.Quantity

abs, add, as, compareTo, divide, doubleValue, eq, eq0, equals, floatValue, format, format, format, ge, ge0, getInUnit, getInUnit, getName, gt, gt0, hashCode, instantiate, instantiateSi, interpolate, intValue, isRelative, le, le0, longValue, lt, lt0, max, mean, min, multiply, ne, ne0, negate, of, product, reciprocal, scaleBy, si, siUnit, subtract, sum, toString, valueOf

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.djunits.value.Scalable

divideBy

Methods inherited from interface org.djunits.value.Value

isAbsolute

Field Details

ZERO

public static final Momentum ZERO

Constant with value zero.

ONE

public static final Momentum ONE

Constant with value one.

NaN

public static final Momentum NaN

Constant with value NaN.

POSITIVE_INFINITY

public static final Momentum POSITIVE_INFINITY

Constant with value POSITIVE_INFINITY.

NEGATIVE_INFINITY

public static final Momentum NEGATIVE_INFINITY

Constant with value NEGATIVE_INFINITY.

POS_MAXVALUE

public static final Momentum POS_MAXVALUE

Constant with value MAX_VALUE.

NEG_MAXVALUE

public static final Momentum NEG_MAXVALUE

Constant with value -MAX_VALUE.

Constructor Details

Momentum

public Momentum(double value,
 Momentum.Unit displayUnit,
 boolean useSi)

Instantiate a Momentum quantity with an SI or base value and a display unit.

Parameters:

value - the quantity value expressed in the SI or base unit

displayUnit - the display unit to use

useSi - use SI value when true, use value in unit when false

Momentum

public Momentum(double valueInUnit,
 Momentum.Unit unit)

Instantiate a Momentum quantity expressed in the given unit.

Parameters:

valueInUnit - the quantity value expressed in the given unit

unit - the unit of the value, also acts as the display unit

Method Details

ofSi

public static Momentum ofSi(double si)

Return a Momentum instance based on an SI value.

Parameters:

si - the si value

Returns:

the Momentum instance based on an SI value

ofSi

public static Momentum ofSi(double siValue,
 Momentum.Unit displayUnit)

Instantiate a Momentum quantity with an SI or base value and a display unit.

Parameters:

siValue - the quantity value expressed in the SI or base unit

displayUnit - the display unit to use

Returns:

the Momentum instance based on an SI value with the given display unit

instantiateSi

public Momentum instantiateSi(double siValue,
 UnitInterface<Momentum> displayUnit)

Description copied from class: Quantity

Instantiate a quantity with an SI or base value, and a display unit.

Specified by:

instantiateSi in class Quantity<Momentum>

Parameters:

siValue - the value expressed in the base (SI) unit

displayUnit - the display unit to use for the quantity

Returns:

a quantity with the given SI or base value, and the given display unit

valueOf

public static Momentum valueOf(String text)

Returns a Momentum representation of a textual representation of a value with a unit. The String representation that can be parsed is the double value in the unit, followed by a localized or English abbreviation of the unit. Spaces are allowed, but not required, between the value and the unit.

Parameters:

text - the textual representation to parse into a Momentum

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the text cannot be parsed

NullPointerException - when the text argument is null

of

public static Momentum of(double valueInUnit,
 Momentum.Unit unit)

Returns a Momentum based on a value expressed in the unit.

Parameters:

valueInUnit - the value, expressed in the given unit

unit - the unit of the value, also acts as the display unit

Returns:

ab Momentum representation of the value in its unit

of

public static Momentum of(double valueInUnit,
 String unitString)

Returns a Momentum based on a value and the textual representation of the unit, which can be localized.

Parameters:

valueInUnit - the value, expressed in the unit as given by unitString

unitString - the textual representation of the unit

Returns:

the Scalar representation of the value in its unit

Throws:

IllegalArgumentException - when the unit cannot be parsed or is incorrect

NullPointerException - when the unitString argument is null

getDisplayUnit

public Momentum.Unit getDisplayUnit()

Description copied from interface: Value

Retrieve the unit of this Value.

Specified by:

getDisplayUnit in interface Value<Momentum>

Overrides:

getDisplayUnit in class Quantity<Momentum>

Returns:

the unit of this Value

divide

public Dimensionless divide(Momentum v)

Calculate the division of Momentum and Momentum, which results in a Dimensionless quantity.

Parameters:

v - quantity

Returns:

quantity as a division of Momentum and Momentum

divide

public Mass divide(Speed v)

Calculate the division of Momentum and Speed, which results in a Mass scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Momentum and Speed

divide

public Speed divide(Mass v)

Calculate the division of Momentum and Mass, which results in a Speed scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Momentum and Mass

divide

public FlowMass divide(Length v)

Calculate the division of Momentum and Length, which results in a FlowMass scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Momentum and Length

divide

public Length divide(FlowMass v)

Calculate the division of Momentum and FlowMass, which results in a Length scalar.

Parameters:

v - scalar

Returns:

scalar as a division of Momentum and FlowMass

multiply

public Energy multiply(Speed v)

Calculate the multiplication of Momentum and Speed, which results in a Energy scalar.

Parameters:

v - scalar

Returns:

scalar as a multiplication of Momentum and Speed

multiply

public Power multiply(Acceleration v)

Calculate the multiplication of Momentum and Acceleration, which results in a Power scalar.

Parameters:

v - scalar

Returns:

scalar as a multiplication of Momentum and Acceleration