A balloon is filled with helium at sea level the volume is measured to be 3.1 Liters at a pressure of 0.97 atmosphere. If the balloon is released it drifts upwards. At height of 4 kilometers the pressure is measured to be 0.61 atmospheres. What is the volume of the balloon?

The volume of balloon is 4.92 L

Calculation

The volume of balloon is calculated using Boyle's law formula

that is P1V1 = P2V2

where P1 = 0.97 atm

V1 = 3.1 L

P2 = 0.61 atm

V2=? L

by making the V2 the subject of the formula.

that is by dividing both side with P2

V2 = P1V1/P2

v2=[ (0.97 atm x 3.1 L) / 0.61 atm] = 4.93 L