can you clarify more about this.Thanks

bhatsideeq5 Sure,
1. Air pressure is the intrinsic pressure in a quantity of air while Atmospheric pressure is air pressure due solely to the weight of the air above you in the atmosphere.
2. Air pressure is variable but Atmospheric pressure is typically around 10^5 N/m^2 on Earth, but can vary with altitude and weather.
3. Air pressure is measured using a wire gauge while atmospheric pressure is measured using a mercury barometer.
4. Air pressure is not universal, it is not present in a vacuum while Atmospheric pressure is universal and is applicable everywhere.