What are the units for pressure and how do I convert between them?

What are the four main units for pressure?

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The four main units of pressure are:
Pascal (Pa) <---- SI Unit
Millimeters of Mercury (mmHg)
Atmosphere (atm)
Torr (torr)
101,000 Pa= 1 atm = 760 mmHg = 760 torr

The four main units of pressure are:

Pascal (Pa) <---- SI Unit
Millimeters of Mercury (mmHg)
Atmosphere (atm)
Torr (torr)

101,000 Pa= 1 atm = 760 mmHg = 760 torr