Asample of helium gas is placed in a rigid cylinder that has a movable piston. the volume of the gas is varied by moving the piston, while the temperature is held constant at 273 k. the volumes and corresponding pressures for three trials are measured and recorded in the data table below. for each of these trials, the product of pressure and volume is also calculated and recorded. for a fourth trial, only the volume is recorded.
determine the pressure of the helium gas in trial 4. [1]