Answer:
Step-by-step explanation:
The unit of measuring air pressure is the "Pascal" (Pa), named after the French mathematician, physicist, and philosopher Blaise Pascal. The Pascal is defined as the SI (International System of Units) unit of pressure, equal to one newton per square meter (N/m²).
Blaise Pascal's work laid the foundation for our understanding of fluid mechanics and hydrodynamics, including the study of pressure in fluids. In the mid-17th century, he conducted experiments involving mercury-filled tubes and established that the pressure applied to a confined fluid is transmitted undiminished throughout the fluid in all directions. This concept is known as Pascal's Principle or Pascal's Law, which is fundamental to the behavior of fluids and pressure measurements.
Mathematically, pressure is defined as force per unit area:
�
=
�
�
P=
A
F
Where:
�
P is the pressure
�
F is the force applied perpendicular to the surface
�
A is the area over which the force is applied
The SI unit of force is the newton (N), and the SI unit of area is square meters (m²). Therefore, the SI unit of pressure, the Pascal (Pa), can be derived as follows:
Pressure (Pa)
=
Force (N)
Area (m
2
)
Pressure (Pa)=
Area (m
2
)
Force (N)
The Pascal is a small unit of pressure, and in practical applications, we often use its multiples or submultiples. For example, the kilopascal (kPa) is equal to 1000 Pascals, and the hectopascal (hPa) is equal to 100 Pascals. These units are commonly used in weather reports to express atmospheric pressure.
In summary, the unit of measuring air pressure, the Pascal, is named after Blaise Pascal, who made significant contributions to our understanding of fluid behavior and pressure. The unit is defined based on the fundamental relationship between force, area, and pressure, and it plays a crucial role in various scientific and practical applications.