Ligdruk

Ligdruk, also known as pressure, is a fundamental concept in physics and engineering, defined as the force applied perpendicular to the surface of an object per unit area. It is a scalar quantity, meaning it has magnitude but no direction. The SI unit for pressure is the pascal (Pa), where 1 Pa is equal to 1 newton per square meter (N/m²).

Pressure can be exerted by any fluid, including gases and liquids. In gases, pressure is due to the random motion of molecules colliding with the walls of their container. In liquids, pressure increases with depth due to the weight of the fluid above. Atmospheric pressure, the pressure exerted by the Earth's atmosphere, is approximately 101,325 Pa at sea level.

Pressure is crucial in various fields. In engineering, it is essential for designing structures and systems that can withstand external forces. In medicine, blood pressure is a vital indicator of cardiovascular health. In meteorology, atmospheric pressure is used to predict weather patterns. Understanding and measuring pressure is fundamental to many scientific and practical applications.