Boyle and his assistant Robert Hooke improved Guericke's air pump design and built their own. From this, through various experiments, they formulated what is called Boyle's law, which states that the volume of a body of an ideal gas is inversely proportional to its pressure.
The collaboration of Boyle and his assistant Robert Hooke on Guericke's air pump led to the creation of their own device, which was used in experiments that ultimately resulted in the development of Boyle's law. This law explains how an ideal gas behaves in relation to its pressure.