public Air(AirFormula formula, double pressure, double temp) : base("air", temp)
{
this.airFormula = formula;
this._pressure = pressure;
}
public Air(AirFormula formula) : this(formula, std_pressure)
{
}
public Air(AirFormula formula, double pressure) : base("air", 20.0)
{
this.airFormula = formula;
this._pressure = pressure;
}