o Have your homework out & your lab notebook & your HW sheet!
o Obtain a copy of the worksheet from the front lab station (1 per person)
o Ask your partner, “ Was the Copper Lab that bad? Aren’t you glad we’re done?”
a.
b.
c.
What causes pressure in a sample of air molecules?
What could cause pressure in the sample to increase?
What could cause pressure in the sample to decrease?
Draw a small particle drawing for parts b, c
I
can predict and explain how the pressure of air changes when air
speed changes (Bernoulli’s Principle)
 I can collect and interpret data to determine the relationship between
pressure and volume (Boyle’s Law)
 I can determine the relationship between pressure, temperature,
volume, and number of molecules in a sample of gas



In your lab group, go over the homework
Team captain = person who went farthest from Maple Valley over Mid-Winter
Break
I will solve any requested problems in a few minutes
The flow/speed of molecules changes gas pressure
 As speed increases, pressure decreases
 As speed decreases, pressure increases
Why?
 Increasing air speed aligns molecules  less collisions, LOWER pressure
 Slower air is more chaotic  more collisions, HIGH pressure
 Molecules like to flow from high  low Pressure

What happens to the fluid in the tube when air travels over the tube?
How does the air move around the ball with the hoses?
How does the air move around the ball with the funnel?
What happens with the ball with you use the toy?

YOUR TURN! Make your bubble levitate!



Today!
Next time!
Pressure
Volume
Temperature
Time after next!!




1.
2.
3.
Obtain a 20 mL plastic syringe
Start the plunger at 20 mL. Cover the tip of the syringe firmly with your finger tip.
Be sure to make a good seal.
Push the plunger until it reaches approximately 15 mL
Apply more pressure to the syringe so that the inside volume is 13 mL, then 10
mL, and so on
What did you experience when you push the plunger down from 20 mL to 15 mL
and then from 15 to 10 mL?
Are you able to push the plunger all the way to the bottom? Explain why or why
not.
Explain why the number of air molecules in the syringe doesn’t change but the
volume does.





Successful lab looks like:
On google documents (YAY SAVING TREES!)
Data table copied and filled in (with units!)
Copied graph of volume vs. pressure
Processing Data Questions 1-10
o Explanations in complete sentences
o Values given with units
1. Use a syringe + a pressure sensor
to determine the relationship
between P and V
2. Get the following data.
3. Use this data, come up with a
formula for the relationship between
pressure and volume.
Volume
(in mL)
5.8
7.8
9.8
11.8
13.8
15.8
17.8
19.8
Pressure P/V= k
( in kPa)
P∙V = k


Sensor set up
Pressure (on channel 1- scroll to the
bottom)
o Pressure sensor in kPa



1b on handout- set syringe to 10ml volume
Attach syringe to sensor and make sure
blue valve is closed
In procedure:
Volume
(in mL)
5.8
7.8
9.8
11.8
13.8
o Don’t do 2, 4, clicking keep/stop in 5, 8, 9

In processing questions:
o Interpret your graph to answer these
15.8
17.8
19.8
Pressure P/V= k
( in kPa)
P∙V = k
Explain Curve?
P/V= k
P∙V = k
Volume
(in mL)
Pressur
e ( in
kPa)
5.8
182.48
31.46
1058.38
7.8
140.31
17.99
1094.42
9.8
111.34
11.36
1091.32
11.8
90.45
7.67
1067.31
13.8
76.52
5.54
1055.98
15.8
57.71
3.65
911.81
17.8
58.34
3.28
1038.45
19.8
51.34
2.59
1016.53





Draw a simple line graph showing the relationship between pressure and volume
Label the axes 
Homework:
Finish the pHet online activity
Boyle’s Law (turn into Google Classroom 1st thing next class)