// Constant interface pattern - do not use!
public interface PhysicalConstants {
    // Avogadro's number (1/mol)
    static final double AVOGADROS_NUMBER   = 6.02214199e23;

    // Boltzmann constant (J/K)
    static final double BOLTZMANN_CONSTANT = 1.3806503e-23;

    // Mass of the electron (kg)
    static final double ELECTRON_MASS      = 9.10938188e-31;
}