How many liters are in 1 ATM?

1 ATM (atmosphere) is a unit of pressure, not volume, so it does not directly correspond to liters. However, at standard temperature and pressure (STP), 1 ATM is equivalent to 1.01325 x 10^5 pascals, which is the same as 101.325 kilopascals (kPa). At STP, 1 mole of any ideal gas occupies approximately 22.4 liters, regardless of the pressure.