The change in the magnitude of the volume of an ideal gas when a small additional pressure `DeltaP` is applied at a constant temperature, is the same as the change when the temperature is reduced by a small quantity `DeltaT` at constant pressure. The initial temperature and pressure of the gas were 300 K and 2 atm. respectively. If `|DeltaT|=C|DeltaP|` then value of C in (K/atm) is __________.