91Ó°ÊÓ

The physical force exerted on an item is known as pressure. The force applied per unit area is perpendicular to the surface of the objects.

A balloon inflated with three breaths of air has a volume of \({\rm{1}}{\rm{.7L}}\)when kept at the same temperature and pressure.

Comparative example: (At same temperature and pressure.)

\(3{\rm{ }}breaths{\rm{ }}of{\rm{ }}air{\rm{ = 1}}{\rm{.7\;L}}\).

\(\begin{aligned}{}1{\rm{ }}breaths{\rm{ }}of{\rm{ }}air\,{\rm{ = }}\frac{{{\rm{1}}{\rm{.7}}}}{{\rm{3}}}{\rm{L}}{\rm{.}}\\{\rm{ = 0}}{\rm{.56\;L}}{\rm{.}}\end{aligned}\)

\(\begin{aligned}{}{\rm{5 }}breaths {\rm{ }} of {\rm{ }} air = 5 \times 1{\rm{ }}breaths {\rm{ }}of{\rm{ }}air\\{\rm{ = 5 \times (0}}{\rm{.56)L}}{\rm{.}}\\{\rm{ = 2}}{\rm{.83\;L}}{\rm{.}}\end{aligned}\)

Initial volume of balloon \({\rm{ = 3}}\) breaths of air

\(\begin{aligned}{}{\rm{ Final volume of balloon = (3 breaths of air ) + (5 breaths of air )}}\\{\rm{ = 1}}{\rm{.7L + 2}}{\rm{.83L}}\\{\rm{ = (1}}{\rm{.7 + 2}}{\rm{.83)L}}{\rm{.}}\\{\rm{ = 4}}{\rm{.53L}}{\rm{.}}\end{aligned}\)

Therefore, the final volume of balloon \({\rm{ = 4}}{\rm{.53\;L}}\).