I know momentum of the airflow inside jet engine generates thrust, but what about the pressure difference in front of and at the back of the engine? The air sucking intake at the front has lower than atmospheric pressure and the exhaust has higher than atmospheric pressure, does this pressure differential contribute to the thrust generated by the engine in adition to the momentum thrust?
The high pressure zone push the engine from the back side and low pressure zone pulls it from the front. For example, if the exhaust has 1 square meter surface area, and the exhaust pressure is 2 atmosphere, then there is pressure equal to 10000 kilograms pushing it from the back since 1 atmosphere is ten thousands kilograms per square meter.
Which of these two is true?