8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Do now!
.Can you readthrough thework we did
last lesson onpressure and
depth?
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Last lesson
Understand that the pressure at a point ina gas or liquid which is at rest acts equallyin all directions
Recall and use the relationship forpressure difference:
pressure difference = height density g
p = hg
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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All directions
.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Pressure and depth
.
Pressure increases with depth(P = gh)
The pressure acts in alldirections
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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.
Pressure difference between top andbottom = gh
= 1000 kg/m3x9.8x0.2
= 1960 N/m2
0.2m
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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This lesson
Understand that a substance can change statefrom solid to liquid by the process of melting
Understand that a substance can change state
from liquid to gas by the process of evaporationor boiling
Recall that particles in a liquid have a randommotion within a close-packed structure
Recall that particles in a solid vibrate about fixedpositions within a close-packed regular structure
Understand the significance of Brownian motion
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Stand up!
.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Draw the sentence
1. 2. 3. 4.
5. 6. 7. 8.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Solids, liquids and gases
.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Properties of solids, liquids andgases
.
Make notesof the
following
slides if you
wish!
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Solids
Fixed shape
Cannot flow
Difficult to compress Generally dense
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Liquids
Shape can change
Can flow
Not easy to compress Generally dense
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Gases
Shape can change
Can flow
Easy to compress Low density
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Changes of state
.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Brownian motion
.
8/3/2019 Lesson 4 States of Matter and Brownian Motion
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Brownian motion Fat droplets in milk
.
Einstein's Explanation of BrownianMotion http://www.practicalphysics.org/fileLibrary/wmv/brownian_
Brownian
Motion
http://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/brownian/brownian.htmlhttp://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/brownian/brownian.htmlhttp://www.practicalphysics.org/fileLibrary/wmv/brownian_motion.wmvhttp://www.practicalphysics.org/fileLibrary/wmv/brownian_motion.wmvhttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=24http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=24http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=24http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=24http://www.practicalphysics.org/fileLibrary/wmv/brownian_motion.wmvhttp://www.practicalphysics.org/fileLibrary/wmv/brownian_motion.wmvhttp://www.practicalphysics.org/fileLibrary/wmv/brownian_motion.wmvhttp://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/brownian/brownian.htmlhttp://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/brownian/brownian.html8/3/2019 Lesson 4 States of Matter and Brownian Motion
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.
Brownian motion is the seeminglyrandom movement of particles suspendedin a fluid (i.e. a liquid or gas). It is due to
the instantaneous imbalance in thecombined forces exerted by collisions ofthe particle with the much smaller liquid
molecules surrounding it.
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What shall we do now?
.
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