PSI (Pressure per Square inch)
The metric unit most often used to describe weight is the Kilogram.
The metric unit used most often to measure liquids is the liter (L). It is a unit of capacity and is commonly used in everyday life and in the scientific community.
The scientific unit used for pressure is the pascal (Pa).
Joules
The unit of measure used to describe electrical "pressure" is the "Volt."
The unit used to represent electrical pressure is VOLTS.
Kelvin. http://en.wikipedia.org/wiki/Kelvin
A scale
Kelvin.
hg is a measurement of Vacuum measured in Inches of Murcury.
Kilogram.
Kg is the abbreviation for kilogram, a unit of mass (or weight) Bar is a unit of pressure often used in describing atmospheric pressure, but also used in other contexts. Standard sea-level atmospheric pressure is slightly less than one bar.