public GasConcentration(GasType gasType, double concentration)
{
_type = gasType;
_concentration = concentration;
}
/// <summary>
/// Creates a new instance of GasConcentration class when gas type code is provided.
/// </summary>
public GasConcentration(string code, double concentration)
{
_type = GasType.Cache[code];
_concentration = concentration;
}