The volume V of a fixed amount of a gas varies directly as the temperature T and inversely as the pressure P. Suppose that V= 70 cm^3 when T = 420 kelvin and P = 18 kg/cm^2 . Find the pressure when T = 140 kelvin and V = 60 cm^3.

In a case where the expression is give as volume V of a fixed amount of a gas varies directly as the temperature T and inversely as the pressure P, then the pressure will be 7kg/cm^2.How can the pressure be calculated?V = k T/ Pand V= 70 cm^3 T = 420 kelvin P = 18 kg/cm^2 where K is constant of proportionality,70 =( k * 420) / 18k = (70 * 18) / 420k= 3Then we were given that the pressure=? T = 140 kelvinV = 60 cm^3then V = k T/ PP= kT/VP= (3*140)/60=7Then the pressure is 7kg/cm^2Read more about expression at:https://brainly.com/question/723406#SPJ1