15. Planck's Constant: 6.626068 x 10^-34 m^2 kg/s

Planck's constant, discovered by Max Planck reflects the size and energy quanta in quantum mechanics. It was used to determine the Heisenberg Uncertainty Principle.

The real application of this number is not yet been found because the quantum-computer is still in theoretical phases, but if it becomes a reality - if engineers are able to design a computer that stores information not in electrical ones and zeros but in six quantum orientations of bits - it could have a bigger impact on the world than the semiconductor.

14. Avogadro's Constant: 6.0221515 x 10^23

It is used to explain atoms, molecules, ions and electrons. For elements, the relative atomic mass expressed in grams contains the Avogadro Constant of atoms.

Avogadro's constant is an interesting relationship between multitudes of different chemical properties. A chemical engineer uses it in stoichiometry, every single day of his life.