Question

A balloon of volume 1.5cm³ containing helium gas at a pressure of 3.0 x 106pa is released from the ground when the temperature is 20°C. What will be the pressure when it reaches a point where the volume becomes 3.0m and the temperature 5°C 

Answer 1

V1 =1.5m³                          V2 = 3.0m³
P1 = 3.0 × 10⁶ Pa                P2  = ?
T1 = 293K                            T2 = 278K
√1
3.0 × 1.5 × 10⁶  = 3.0 × P₂  
       293                   278
P₂ = 3.0 × 1.5 × 10⁶ × 278
               3.0
P₂ = 4.17 × 10⁸Pa