Pressure:

• The force per unit area is called pressure. It is denoted by P.
• The SI unit of pressure is the pascal (Pa).
• It is a scalar quantity because the pressure acts in all directions at a point inside a gas.

The basic formula for pressure is given by:

Pressure = Force/Area

mm Hg unit of Pressure

• mm Hg unit of pressure is the pressure equivalent to
•  It is the extra pressure exerted by the mercury column of one-millimeter high mercury.
• 1mm Hg =  133.322387415 pascals

Torr

• The torr is another unit of pressure.
• It is equivalent to 1/760 of an atmosphere.
• The unit of pressure was named after Evangelista Torricelli, an Italian Scientist.

Newton is not the unit of pressure. it is the unit of force. So, the correct option is Newton.