Chapter 5, Problem 5.1QP

Interpretation Introduction

Interpretation:

The pressure should be defined and its unit should be given in terms of SI base units.

Definition of Pressure:

Pressure or Stress is the force applied perpendicular to the surface of an object per unit area.

SI units:

SI units are defined as International system of units and SI derived units are the units of measurements derived from the seven base units.  They can be dimensionless or described as one or more of the base units.

SI units are a system of physical units namely meter, second, kilogram, candela, Kelvin, ampere, and mole.

SI derived unit of pressure is Pascal (Pa).

$\begin{array}{l}\text{1 Pascal }\text{= N}{\text{.m}}^{\text{-2}}\hfill \\ \text{= kg}{\text{.m}}^{\text{-1}}{\text{s}}^{\text{-2}}\hfill \end{array}$

Explanation of Solution

When an object having one kilogram of mass and it is placed in one square meter area the pressure possessed by the object on the area is given by ${\text{1 kg/m}}^{\text{2}}$ is equals 9.80665 Pascal’s and it is shown in below figure 1,

Figure 1

Conclusion

The term Pressure is defined and SI unit is given.