11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 21) Pressure is determined as force per unit area of the surface. The S.I. unit of pressure, pascal is as shown below: \[1\,Pa=1N{{m}^{-2}}\] If mass of air at sea level is 1034 g\[c{{m}^{-2}}\], calculate the pressure in pascal.  

    Answer:

    Pressure = Weight per unit area (weight = m x g) \[=\frac{1034}{1c{{m}^{2}}}\times 9.8m{{s}^{-2}}\] \[=\frac{1034\times 9.8m{{s}^{-1}}}{1c{{m}^{2}}}\times \frac{1kg}{1000g}\times \frac{100cm}{1\,m}\times \] \[\frac{\text{lN}}{\text{kg}\,\text{m}{{\text{s}}^{\text{-2}}}}\times \frac{\text{lpa}}{\text{lN}{{\text{m}}^{\text{-2}}}}\] \[=1.01332\times {{10}^{5}}Pa\]  


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