Question

Julie blows a bubble. At first, the pressure of the gas in the bubble is 4kPa. The bubble floats into the air and expands. When it gets to the top of a tree the bubble has a pressure of 2kPa and a volume of 3.5m³. Assuming a constant temperature, what was the volume in m³ of the bubble when it was first blown?

Answer 1

V₁ = 1.75 m³

Step-by-step explanation:

Assuming the gas to be an ideal gas. At constant temperature, the relationship between the volume and temperature of an ideal gas is given by Boyle's Law as follows:

`P_(1)V_(1) = P_(2)V_(2)`

where,

P₁ = Initial Pressure of the Gas = 4 KPa

V₁ = Initial Volume of the Gas = ?

P₂ = Final Pressure of the Gas = 2 KPa

V₂ = Final Volume of the Gas = 3.5 m³

Therefore,

`(4\ KPa)V_(1) = (2\ KPa)(3.5\ m^(3))\\\\V_(1)=(2\ KPa)/(4\ KPa)(3.5\ m^(3))\\\\`

V₁ = 1.75 m³