Which of the following quantities have its SI unit named after Blaise Pascal?

Pressure

The correct answer is option 2. Pressure.

Blaise Pascal, a prominent French mathematician, physicist, and philosopher, made significant contributions to various fields of science and mathematics. One of his notable contributions is in the field of fluid mechanics and pressure, for which the SI unit of pressure is named after him.

The SI unit of pressure, the pascal \((Pa)\), is defined as one newton per square meter \((N/m^2)\). It is used to measure the force exerted on a surface per unit area. Pressure is a fundamental concept in physics and plays a crucial role in various phenomena, such as fluid dynamics, atmospheric science, and engineering.

Pascal's work on pressure laid the foundation for the understanding of fluid behavior, including hydrodynamics (the study of fluid flow) and hydrostatics (the study of fluids at rest). His insights into the behavior of fluids under pressure have practical applications in fields such as engineering, meteorology, and geology.

In summary, Blaise Pascal's contributions to the understanding of pressure and fluid mechanics led to the establishment of the pascal as the SI unit of pressure, which is widely used in scientific research, engineering, and everyday applications.