Atmospheric pressure is measured in pascals (Pa), atmospheres (atm), and millimeters of mercury (mmHg). Essentially, mmHg is the original measurement born from an experiment designed to define "atmospheric pressure." On the other hand, the unit Pa defines the amount of pressure and the unit atm defines a new unit for atmospheric pressure itself.
Atmospheric pressure is 101325 Pa at sea level, which is equivalent to 1 newton per square meter. This can also be written as 101.325 kPa, which is in the unit kilopascal and is easier to read.
Often, atmospheric pressure is written as 1 atm at sea level, which is just another way of saying 101.325 kPa.
Finally, atmospheric pressure can be written in the primary unit millimeters of mercury mmHg. At sea level, atmospheric pressure is at 760mmHg.
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