Presuming that the gas behaves like an ideal gas:
Volume in cubic meter V= 59.6x 0.001= 0.0596 mÂł
n=3.01 mol
Temperature in Kelvin T=44.9+273.15=318.05 K
R= 8.413 J/ mol K
The ideal gas law:
PxV= nxRxT
Substituting the give information from the question into the ideal gas law:
P= 3.01 mol x 8.413 J/mol k x 318.05 K / 0.0596= 133544.392 Pa
1351.3458 Pa / 101325 Pa/ atm = 1.3179806 atm