In 1659 he constructed the "Pneumatic Engine", which was Otto von Guericke's air pump with improvements.
Boyle's law PV=k P – the pressure of the gas V – the volume of the gas k-constant «The absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain unchanged within a closed system»
In the book Boyle attacks the Aristotelian theory of the four elements (earth, air, fire, and water) and also the three principles (salt, sulfur, and mercury) proposed by Paracelsus. He represents hypothesis that matter consisted of atoms and clusters of atoms in motion and that every phenomenon was the result of collisions of particles in motion.
Boyle's major discoveries and theories: Elements are ultimately composed of particles of various sorts and sizes He designated the technique of detecting mixture's and compound's ingredients, by the term "analysis" There is a distinction between mixtures and compounds. Elements are the indecomposable constituents of material bodies.
Theological interests promoted the spread of Christianity in the East contributed liberally to missionary societies supported translating the Bible or portions of it into various languages believed that all human beings, no matter how diverse their physical differences, came from the same source: Adam and Eve Boyle's writings mentioned that for Europeans beauty was not measured so much in color of skin, but in "stature, comely symmetry of the parts of the body, and good features in the face".