Class

NSUnitPressure

A unit of measure for pressure.

Declaration

@interface NSUnitPressure : NSDimension

Overview

You typically use instances of NSUnitPressure to represent specific quantities of pressure using the NSMeasurement class.

Pressure

Pressure is the normal force over a surface. The SI unit for pressure is the pascal (Pa), which is derived as one newton of force over one square meter (1Pa = 1N / 1m2).

The NSUnitPressure class defines its base unit as newtonsPerMeterSquared, and provides the following units, which are initialized using NSUnitConverterLinear converters with the specified coefficients:

Name

Method

Symbol

Definition

Newtons Per Meter Squared (Equivalent to Pascals)

newtonsPerMeterSquared

N/m²

1.0

Gigapascals

gigapascals

GPa

1e9

Megapascals

megapascals

MPa

1000000.0

Kilopascals

kilopascals

kPa

1000.0

Hectopascals

hectopascals

hPa

100.0

Inches of Mercury

inchesOfMercury

inHg

3386.39

Bars

bars

bar

100000

Millibars

millibars

mbar

100

Millimeters of Mercury

millimetersOfMercury

mmHg

133.322

Pounds Per Square Inch

poundsPerSquareInch

psi

6894.76

Topics

Accessing the Base Unit

+ baseUnit

Returns the base unit of pressure. Equal to newtonsPerMeterSquared.

Accessing Predefined Units

+ newtonsPerMeterSquared

Returns the newtons per meter square unit of pressure.

gigapascals

Returns the gigapascals unit of pressure.

megapascals

Returns the megapascals unit of pressure.

kilopascals

Returns the kilopascals unit of pressure.

hectopascals

Returns the hectopascals unit of pressure.

inchesOfMercury

Returns the inches of mercury unit of pressure.

bars

Returns the bars unit of pressure.

millibars

Returns the millibars unit of pressure.

millimetersOfMercury

Returns the millimeters of mercury unit of pressure.

+ poundsPerSquareInch

Returns the pounds per square inch unit of pressure.

Relationships

Inherits From

Conforms To

See Also

Mass, Weight, and Force

NSUnitMass

A unit of measure for mass.