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First attempt Second attempt Third attempt Fourth attempt Fifth attempt Average diameter Radius (D/2) Diameter in cm. (D) . 5. Once you have established your average diameter of your balloon in cm. You have to do some math to figure out how many cubic centimeters the area of your balloon is. Sphere Volume = 4/3 • π • r³= ____ml Use a scientific calculator and punch in 4/3 x Pi x radius = volume in cm3 To find the volume in liters divide by 1000. What is your Vital Lung Capacity? ________________Liters Questions: 1. Describe what occurs to cause inhalation and exhalation. 2. What are some factors that can affect how large your Vital Lung Capacity will be? 5. If you were to take a maximum volume breath every time you inhaled, how much air would you inhale and exhale in 1 minute? (Breaths per minute x vital lung capacity) 6. Why did you do five trials instead of just one to obtain results for this experiment? 7. How might an individual increase his/her vital capacity? 8. Would smoking increase or decrease an individual’s vital lung capacity? 9. How would an asthma attack affect the tidal volume?

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