Pressure

Pascal's Law states that pressure applied to a confined fluid is transmitted equally in all directions. This principle is used in hydraulic systems like car lifts and braking systems.

A sharp knife has a smaller surface area in contact with the object, which increases the pressure for a given force, making it easier to cut.

Atmospheric pressure is the pressure exerted by the Earth's atmosphere on all objects. It is approximately 101,325 Pa at sea level.

The SI unit of pressure is the Pascal (Pa), which is equivalent to one Newton per square meter (1 N/m2).

Hydraulic systems use pressure applied at one point to be transmitted through a fluid to another point, effectively multiplying the force applied. This principle allows for mechanisms like hydraulic lifts and brakes to function effectively.

Pressure cookers increase the boiling point of water by increasing the pressure inside the cooker. This allows food to cook faster and more efficiently at higher temperatures.

In the context of atmospheric and fluid pressures, negative pressure typically refers to a partial vacuum. However, absolute negative pressure is not physically meaningful in those contexts.

Atmospheric pressure variations are crucial in weather formation. Low pressure often leads to cloud formation and precipitation, while high pressure tends to bring clear skies.

In fluids, pressure increases with depth due to the weight of the fluid above increasing the force over a given area.