The pressure of a gas p (v) varies inversely with the volume of the gas v. the pressure of a gas measures 8 kg/cm² when its volume is 40 cm³. Which equation can be used to find the pressure of the gas when the volume is changed?
a. p(v)=5v
b. p(v)=320v
c. p(v)= 320/v
d. p(v)= 5/v