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? Give your answer to three significant figures.

Answer 1

Answer:

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? Give your answer to three significant figures.

7.5m¾

Answer 2

Answer:

1.75m³

Explanation:

pV = constant

2kPa × 3.5m³ = constant

7 Pa m³ = constant

pressure = constant/volume

Rearrange the equation above to get:

volume = constant/pressure

volume = 7/4

volume = 1.75m³