Inches of Mercury
Inches of Mercury (inHg) are used to measure pressure in the imperial system. Traditionally this unit is used in the United States for barometric pressure in weather reports. It is the pressure from a column of mercury exactly one inch high at standard gravity.
Newtons per meter squared
Newtons per meter squared is the same as Pascals (Pa). It is one Newton of force exerted on an area of one square meter.