Boyle’s Law Pressure and Volume Mr. Huff February 4, 2003 Pressure Gas particles are in constant motion. Gas particles collide with each other. Gas particles collide with the walls of a container. The gas exerts a push on the walls of a container. Pressure is measured in kilopascals (kPa). Math Application: Pressure = Force ÷ Area Volume Volume is the amount of space that matter occupies. Do solids and liquids have volume? Do gases have volume? Volume is measured in mL and cm3. Remember: 1 mL = 1 cm3 Math Application: V = l x w x h Relating Gas Pressure and Volume How can we relate the pressure and volume of a gas? What kind of experiment do we need to develop in order to relate the pressure and volume of a gas? Procedure We will use a syringe connected to a gas pressure sensor to study the relationship between pressure and volume. The syringe will allow us to change the volume of the gas. The pressure sensor will monitor the changes in gas pressure as the volume changes. Plot the pressure and volume data. Begin experiment. Variables Graphs are diagrams that tell how two variables are related. Changes in one variable results in changes of another variable. The dependent variable is the variable that you control. What is the dependent variable in this experiment? Boyle’s Law When the pressure of a gas increases, then its volume decreases. ↑P ~ ↓V When the pressure of a gas decreases, then its volume increases. ↓P ~ ↑V Boyle’s Law and Inhalation The rib cage expands and the diaphragm moves downward. The volume of the lungs increases. This increases causes a decrease in pressure. The atmospheric pressure is greater than the pressure in the lungs. Air flows into the lungs. Boyle’s Law and Medical Syringes The technician draws the plunger out. The volume of the syringe increases. This causes a decrease in pressure. The liquid is at a greater pressure than the inside of the syringe. The liquid flows into the syringe.
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