Class: Pressure

The Pressure class is a subclass of Variable designed to represent a force per unit area. It ensures accurate calculations by storing all values internally in its base SI unit, Pascals (Pa).

Supported Units

The following units are supported for initialization and conversion.

Unit	str	Conversion Factor to Pascals (Pa)
Pascals	Pa	1
kilopascals	kPa	103
megapascals	MPa	106
bar	bar	105
atmospheres	atm	101325
pounds per square inch	psi	6894.76
millimeters of mercury	mmHg	133.322
torr	torr	133.322

Class Reference

class Pressure(value, units='Pa')

A class for handling pressure measurements with automatic unit conversion.

Parameters:

• value : float or int
  The numeric value of the pressure. Must be a non-negative number.
• units : str, default='Pa'
  The unit of the provided value. Must be one of the supported units.

Raises:

• ValueError : If value is negative.
• TypeError : If units is not a valid unit.

Examples:

# Create a Pressure object of 1 atmosphere  
>>> p1 = Pressure(1, "atm")

# Create a Pressure object of 101325 Pascals  
>>> p2 = Pressure(101325, "Pa")

Properties

Property	Type	Description
.value	float	The numeric value of the pressure as provided during initialization. This is inherited from the Variable base class.
.units	str	The string representation of the variable's units, as provided during initialization. Inherited from the Variable base class.
.original_value	float	The numeric value as provided during initialization.
.original_unit	str	The unit as provided during initialization.

Methods

to(target_unit)

Returns a new Pressure object converted to the target_unit. The original object remains unchanged.

Parameters:

• target_unit : str
  The unit to convert to. Must be one of the supported units.

Returns:

• Pressure
  A new Pressure object with the same value, represented in the target unit.

Examples:

# Initialize a pressure of 1 atm  
>>> atm_pressure = Pressure(1, "atm")

# Convert to psi  
>>> psi_pressure = atm_pressure.to("psi")

>>> print(psi_pressure)  
14.695949 psi

String Representation

• __str__(self)
  Returns a human-readable string representation of the pressure, rounded to six decimal places, using its original value and unit.
• __repr__(self)
  Returns a string representation suitable for developers and debugging, showing the internal values.