5.4 Pressure 1. What is the formula for pressure? What are the most common units

Question

5.4 Pressure 1. What is the formula for pressure? What are the most common units of pressure? Figure 5.5: Two Balloons 2. Before we do anything, let us conduct a thought experiment. If we were to take our straws, and blow air directly in between the two balloons, what would happen? Would the balloons blow apart, move together, or not move at all? Briefly explain your reasoning 3. Now go to the station with two balloons hanging from strings. Have one team member blow air in between the 4. Explain the results of problem 2 using the idea of pressure. Figure 5.6: Straw submerged in fluid 5. For this question, refer to Figure 5.6.Explain how a straw works in terms of pressure and Bernoulli's equation. Why does fluid not flow out of the straw if we submerge it in water and hold our thumb on the top? 131

Explanation / Answer

1) P=F/A

unit is pascal that is 1 N/m2

2) if you blow air

P+V2/2g = constant

when velocity increases pressure will drop and ballon will close to each other.

3) predictions confirm our reasoning

4) refer answer 2

5

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