Scientific laws describe how the physical world behaves. In the realm of fluid mechanics, a few laws are especially important.
Pascal’s Law
“Pressure applied to a confined fluid is transmitted equally in all directions.”
This principle makes hydraulic systems work. A small force applied to a small piston can produce a huge force on a larger piston—like in a hydraulic car jack.
Boyle’s Law
Relates the pressure and volume of gas:
When temperature is constant, pressure increases as volume decreases.
This explains how pneumatic systems store energy in compressed air.
Archimedes’ Principle
An object immersed in a fluid experiences an upward buoyant force equal to the weight of displaced fluid.
This tells us why ships float and submarines dive.
Bernoulli’s Principle
Fast-moving fluids have lower pressure.
It explains airplane lift and how perfume sprayers work.
Understanding these laws helps engineers design efficient machines, vehicles, and systems used daily in industries worldwide.