This law was formulated by Robert Boyle in 1662. It states, "The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the empreature remins constant.:

Mathematically,

pv = Constant

The more useful form of the above equation is :

P1V1 = P2V2 = P3V3 = ... = Constant

here suffixes 1, 2 and 3 ..... refer to different sets of conditions.