WEEK 9
The Law of Conservation of Matter &
Pascal's Law--How Liquids Behave
(SU ch. 9&10, ME ch. 1 & LG ch. 2)
Antoine Laurent Lavoisier and His Wife (Marie Anne Pierrette Paulze, Jacques Louise David, 1788, The MET, Public Domain PD-1923
DAY 1: The Law of Conservation of Matter
READING
Whole chapter.
NARRATION PROMPTS
1. What is the Law of the Conservation of Matter?
2. Describe an example which demonstrates the Law of Conservation of Matter. 3. What is the significance of the Law of Conservation of Matter? TIMELINE AND BOOK OF CENTURIES
NOTES
None yet.
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DAY 2: Pascal's Law--Water Pressure
READING
From "beginning" to "...the other tube to rise."
NARRATION PROMPTS
1. What is water pressure?
2. Draw a picture in your science journal which demonstrates something you have learned about water pressure. TIMELINE AND BOOK OF CENTURIES
1. Blaise Pascal (1623 - 1662, France)
NOTES
The important concept to take away is that liquid pressure (P*), for a given liquid and at a given location, is only dependent on the height (p) or depth of the liquid. The two quantities are directly proportional, meaning, as one goes up, the other goes up, too.
P ∝ h
Liquid pressure is actually dependent on two other factors: the density of the liquid (ρ-Greek letter rho) and the acceleration due to gravity at the location of the liquid. However, for a given liquid at a given location, these are constants.
P = ρgh
The pressure of a column of water at sea level would be different than the same column of water at the top of Mt. Everest because g is greater at sea level. Meanwhile, at the same location, the pressure of a column of water would be greater than the pressure of an equal column of olive oil, which is less dense than water.
*P, not to be confused with P which stood for period when we studied Kepler's Laws in Week 2.
DEMONSTRATION
We took two plastic containers (2-liter bottle and 1-gallon milk jug), drilled small holes about 1/2 inch from the bottom and then, while holding a finger over the holes, filled the containers with equal heights of water. We then removed our fingers and watched the streams of water coming out of the holes. Then, with one container, we watched the stream of water as we added water, increasing the height of the water in the container. This latter demonstration is simply a different take on the demonstration of a single jug with holes at multiple heights.
CORRECTIONS
SU p. 89. The picture is missing the labels "A" and "B." Write "A" over the top of the water on the left (the wider side) and B over the top of the water on the right (the narrower side).
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DAY 3: Pascal's Law--Additional Pressure
READING
From "Pascal also considered..." to "end of chapter"
NOTES
None yet.
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