In engineering measurement, pressure actually means strength. But in physics, pressure refers to a force, which is relative to tension. In actual work, we often understand pressure as strength, which can easily cause confusion or misunderstanding.
(1) Pressure in engineering refers to: the force acting vertically and evenly on a unit area, that is, pressure.
Pressure is called "pressure" in physics.
In the International System of Units, the unit of pressure measurement is Pascal, represented by the symbol Pa, which is a derived unit with a special name in the International System of Units. The decision to use this name as the unit of pressure is to commemorate the great French scientist Pascal (B. Pascal, 1623~1662).
Pascal's principle: When the pressure generated by an external force acting on a closed fluid is transmitted to any direction of the fluid, its intensity remains unchanged.
This law of pressure transmission has played an important role in the development of hydraulic technology. For example, hydraulic presses, jacks and hydraulic brakes are all made based on Pascal's original principle. At the same time, Pascal's principle is also the basic principle based on pressure measurement calibration.
(2) Piston system (also known as: piston and piston cylinder assembly): a pressure measuring component composed of a piston and a piston cylinder that are precisely matched.
(3) Special silicon code: a silicon code that is matched to the pressure generated by the piston pressure gauge.
(4) Atmospheric pressure, also known as air pressure: refers to the pressure generated by the gravity of the air column in the atmosphere on the surface of the earth.
(5) Gauge pressure: pressure greater or less than atmospheric pressure with atmospheric pressure as the reference point.
(6) Positive [gauge] pressure (also known as: positive pressure): pressure greater than atmospheric pressure with atmospheric pressure as the reference point.
(7) [Simple] piston: a cylindrical rod-shaped part that bears a force balance state when the piston pressure gauge measures pressure.
(8) Piston pressure gauge base [calibrator]: a base that can be installed with the piston system bracket and has a pressure-generating function.
(9) Dynamic pressure: pressure that changes with time in the field of study.
(10) Pressure unit: The pressure unit in the International System of Units is N/m^2, also known as Pascal, or "Pa" for short (represented by Pa). Its physical meaning is the pressure generated by a Newton's force acting vertically and uniformly on an area of 1 square meter.