Pressure notes - O-level physics
The file pressure-notes-olevel-phy.pdf contains notes on the concept of pressure in physics. It discusses the definition of pressure, the SI unit of pressure, and how pressure is calculated. The file also explains how pressure varies with depth in liquids and how Pascal's principle is applied in hydraulic machines.A summery;
Pressure is the force exerted normally per unit area. The SI unit of pressure is the Pascal (Pa).
Pressure in liquids depends on the depth of the liquid, the density of the liquid, and the acceleration due to gravity. The pressure increases with depth.
Pascal's principle states that pressure applied at any point of an enclosed fluid is transmitted equally throughout the whole fluid in all directions. This principle is applied in hydraulic machines, such as hydraulic presses and hydraulic jacks.
In a hydraulic machine, a small force applied at one point of an incompressible liquid produces a larger force at the other points of the liquid. This allows us to lift heavy objects using a small force.
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