README
archimedes-principle
I had a question about helium...
The following script will serve as the example for this readme by answering that question with the help of Archimedes' principle and the ideal gas law ...
// install: `npm install gas-density-calcuator archimedes-principle`
var gaslaw = require('gas-density-calculator');
var archimedes = require('./');
// What volume of helium at standard pressure and temperature is required to lift one kilogram total mass?
var totalMass = 1;
// First get the density of helium at STP
var densityHelium = gaslaw.getDensity({
molecularWeightGramMole: 4.002602,
temperatureKelvin: 273.15,
pressureKiloPascal: 101.325
});
// now get the density of air at STP
var densityAir = gaslaw.getDensity({
molecularWeightGramMole: 28.97, // Molecular mass of air: http://www.engineeringtoolbox.com/molecular-mass-air-d_679.html
temperatureKelvin: 273.15,
pressureKiloPascal: 101.325
});
// Now determine the volume
var minVolume = archimedes.minVolumeForBouyancy({
fluidDensity: densityAir,
objectDensity: densityHelium,
mass: totalMass
}).toFixed(4);
var gallons = minVolume * 264.17;
console.log("at standard temperature and pressure, a "+Math.ceil(gallons)+" gallon bag filled with helium can probably make 1kg mass bouyant");
Let's run it:
luchia :: ~/Projects/archimedes-principle ‹master*› » node helium.js
at standard temperature and pressure, a 238 gallon bag filled with helium can probably make 1kg mass bouyant