Question

Pressure of 1 atm is _________ Pa

Answer 1

Pressure:

1. The formula for pressure is thrust per unit area, thus it is proportional to thrust directly and inversely to the area.
2. Pressure is a scalar quantity, meaning it only has a magnitude and no direction.
3. The value of pressure can be either positive or negative.

Value of $1atm$ in $Pa$:

1. The SI unit of pressure is the pascal. and one pascal is equal to $1$ newton force applied on an area of $1m^2$
2. One bar is equal to the atmospheric pressure at the average sea level and at $g=9.8m{s}^{-2}$ where, $g$ is the acceleration due to gravity. There are other units of pressure like bar and dyne.
3. The atmospheric pressure occurs when the earth pulls the gases towards itself due to its gravitational pull. $1atm$ is the pressure at the average sea level. At the different points, the value of atmospheric pressure varies.
4. As we know that $1bar={10}^{5}pa.....\left(i\right)and1atm=1.01325bar.....\left(ii\right)$.
5. From equations (i) and (ii), we can easily get

$$\begin{gathered} 1atm=1.01235\times {10}^{5}Pa \\ 1atm=101325Pa \end{gathered}$$

Hence, the pressure of 1 atm is $101325$ Pa.