PhysicalConstants.java

// Constant utility class
package org.effectivejava.examples.chapter04.item19;

public class PhysicalConstants {
	private PhysicalConstants() {
	} // Prevents instantiation

	// Avogadro's number (1/mol)
	public static final double AVOGADROS_NUMBER = 6.02214199e23;

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

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