Chapter 14, Problem 77A

Interpretation Introduction

Interpretation: An aerosol can's compressed gas forces paint out, and the gas pressure inside the can changes as the paint spray is to be described.

Concept introduction: Compressing the gas results in a decrease in pressure while simultaneously producing an increase in volume.

Answer to Problem 77A

When the valve is opened, paint is forced through the nozzle by force. The small nozzle divides the paint flow into tiny drops and disperses it into a thin spray. When more paint is used, more space is made for the gas, resulting in a decrease in pressure.

Explanation of Solution

The compressed gas within an aerosol can force the paint out of the container. By applying pressure, the gas is transformed into a liquid. Inside the container, the pressure created by the vapor forces the product out. When the valve is opened, pressure drives the paint through the nozzle.

Pressing the can's nozzle change the air pressure inside the can, causing the liquefied gas to boil and form a vapor. When the button on the nozzle is pressed, gas is forced through the hole in the nozzle, which causes the vaporized paint to be released and creates a "spray" effect.

Conclusion

When the valve is opened, paint is forced through the nozzle by force. The small nozzle divides the paint flow into tiny drops and disperses it into a thin spray. When more paint is used, more space is made for the gas, resulting in a decrease in pressure.