@hugoalh/pressure

Pressure (NodeJS)

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📝 Description

A NodeJS module to convert pressure units.

Units of pressure are from "Wikipedia - Pressure measurement - Units".

	Name ASCII	Name Standard	Symbol ASCII	Symbol Standard	... (*: Exclusive)
[SI] Pascal	Pascal	Pascal	Pa	Pa
Bar	Bar	Bar	bar	bar
Pound Per Square Inch	PoundPerSquareInch	Pound Per Square Inch	psi	psi
Standard Atmosphere	StandardAtmosphere	Standard Atmosphere	atm	atm
Technical Atmosphere	TechnicalAtmosphere	Technical Atmosphere	at	at
Torr	Torr	Torr	Torr	Torr

📋 Notice

This module uses the built in JavaScript Number type, which is a floating point number with a limited precision of 64 bits, about 16 digits. Floating point numbers round-off errors can occur during calculations:

0.1 + 0.2;
//=> 0.30000000000000004

In most cases, round-off errors do not matter, they have no significant impact on the results. However, it looks ugly when displaying output to a user. A solution is to limit the precision just below the actual precision of 16 digits in the displayed output:

(0.1 + 0.2).toPrecision(14);
//=> 0.3

📚 Documentation

Getting Started

• NodeJS ^ v12.20.0 || ^ v14.15.0 || >= v16.13.0

npm install @hugoalh/pressure

/* Either */
import { ... } from "@hugoalh/pressure";// Named Import
import * as pressure from "@hugoalh/pressure";// Namespace Import
import Pressure from "@hugoalh/pressure";// Default Import (Class `Pressure`)

API

Class

• new Pressure(value: number, unit: PressureUnits = "Pa"): Pressure;
    .toJSON(keyType: PressureToJSONKeyType = "symbolASCII"): { [x: string]: number; };// Get all of the units value.
    .toStringASCII(unit: PressureUnits = "Pa"): string;// Get unit's value with ASCII symbol.
    .toStringStandard(unit: PressureUnits = "Pa"): string;// Get unit's value with Standard symbol.
    .toValue(unit: PressureUnits = "Pa"): number;// Get unit's value.
  
  Pressure.difference(a: Pressure, b: Pressure): PressureDifference;// Calculate pressure difference by units.
  Pressure.unit(unit: PressureUnits): PressureUnitMeta;// Get a pressure unit meta.
  Pressure.units(): PressureUnitMeta[];// Get all of the pressure units meta.
  Pressure.unitSI(): PressureUnitMeta;// Get pressure SI unit meta.

Interface / Type

• type PressureToJSONKeyType = "nameASCII" | "nameStandard" | "symbolASCII" | "symbolStandard";

• interface PressureUnitMeta {
    isSIUnit: boolean;
    nameASCII: string;
    nameStandard: string;
    symbolASCII: string;
    symbolStandard: string;
  }

Example

new Pressure(1, "Bar").toValue("Pa");
//=> 100000

new Pressure(1, "Bar").toStringStandard("Pa");
//=> "100000 Pa"

new Pressure(100000).toValue("Bar");
//=> 1

new Pressure(100000).toStringStandard("Bar");
//=> "1 bar"