calculation formula isP=F/S
The unit of pressure is related to the weight of the object and the area under force.
pressure in physics refers to the force acting perpendicularly on the surface of an object. The stressed object is the support surface of the object, the action point is on the contact surface, and the direction is perpendicular to the contact surface. When the stressed object is horizontal, pressure (F)= weight [please note that it is different from mass (g),G = mg]]. In this case, the unit of pressure is newton (abbreviated to the letter "N").
PSIEnglish full name is Pounds per square inch.
P is pound,S is square, and I is inch.
changing all the units to metric units can be calculated:1bar≈14.5psi
1psi=6.894757kPa=0.0689476bar
Europe and the United States and other countries used to use psi as a unit
in China, we generally use the pressure of the gas as"kg"description (rather than" jin "), the unit is"kgf/cm2", a kilogram of pressure isa kilogram of force acting on a square centimeter.
the unit commonly used abroad is "psi", the specific unit is "lb/in²", that is, "pounds force/square inch", this unit is like the Fahrenheit temperature scale (℉).
in addition, there arePa(Pascal, one Newton acting on one square meter),kPa,MPa,bar, mm water, mm Hgand other pressure units.
1 bar = 0.1 MPa = 100 kPa = 1.0197162 kgf/cm2
1 Standard atmospheric pressure (atm)= 0.101325 MPa = 1.01325 bar
because the unit difference is very small, if it is not to be calculated accurately, you can remember:
1 bar = 1 standard atmospheric pressure (atm)= 1 kgf/cm2 = 100 kPa = 0.1 MPa
Conversion
1 standard atmospheric pressure = 760mm mercury column = 76cm mercury column = 1.01325 × 105Pa = 10.336m water column. 1 standard atmospheric pressure = 101325 N/㎡. (In the calculation is usually 1 standard atmospheric pressure = 1.01 × 105Pa)
if you want to do accurate calculation, the relationship is as follows:
pressure conversion relationship:
1 dyne/square centimeter (dyn/cm2)= 0.1 Pa (Pa)
1 Torr = 133.322 Pa (Pa)
1mm Hg (mmHg)= 133.322 Pa (Pa)
1mm water column (mmH2O)= 9.80665 Pa (Pa)
1 engineering atmospheric pressure = 98.066 5千帕(kPa)
1千帕(kPa)= 0.145 pounds-force/square inch (psi)= 0.0102 kilograms-force/square centimeter (kgf/cm2)= 0.0098 atmospheres (atm)
1 pound force per square inch (psi)= 6.89 5千帕(kPa)= 0.0703 kilograms force per square centimeter (kgf/cm2) = 0.0689 bar = 0.068 atmospheres (atm)
1 physical atmospheric pressure (atm)= 101.32 5千帕(kPa)= 14.695949400392 pounds-force per square inch (psi)= 1.01325 bar