A Lesson From The Mathematics & Science Center The Mathematics & Science Center.
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Transcript of A Lesson From The Mathematics & Science Center The Mathematics & Science Center.
A Lesson FromA Lesson From
The Mathematics & Science CenterThe Mathematics & Science Center
Did you know—Did you know—-About 75% of the Earth’s surface is covered -About 75% of the Earth’s surface is covered by water?by water?
-Most of that water is in the oceans!-Most of that water is in the oceans!
-The amount of salt in different oceans’ water -The amount of salt in different oceans’ water determines the types of plants and animals determines the types of plants and animals that live there.that live there.
-Ocean water with lots of salt is heavier or -Ocean water with lots of salt is heavier or denser and moves to the bottom through denser and moves to the bottom through currents.currents.
-Oceanographers use the term -Oceanographers use the term salinitysalinity to to refer to the amount of salt in the water.refer to the amount of salt in the water.
Refraction of Light Refraction of Light Through WaterThrough Water
Can light bend?
Refraction of Light Through Refraction of Light Through GlassGlass
Light
REFRACTION
Light slows down and bends as it passes through substancesof different densities.
Refraction Lab
Which is saltier?The Atlantic Ocean
or……..
The Chesapeake Bay or…
The James River?
Atlantic Ocean
Ch
esap
eake
Bay
Map of Virginia
Fresh water from rain, and rivers and streams.
Salinity of the Bay depends on the amount of rainfall.
Most fresh water comes into Bay from northern & western rivers, causing Bay water to be less salty in north and west areas.
Bay receives salt water from Atlantic Ocean, causing Bay water to be more salty closer to ocean.
Differences in Salinity
Freshwater Habitats Ponds, Lakes, Streams, Rivers
Virginia’s aquatic habitats contain water of varying salinities.
Brackish Water Habitats Streams, Rivers, Marshes
Bay and Full Ocean Water Habitats Chesapeake Bay, Atlantic Ocean
Salinity Refractometer
Raise the plastic cover plate.
Using an eyedropper, place2-3 drops of water on the blue glass surface.
Lower the cover plate so that the water spreads across the surface. Make sure that the cover is flat.
Using a Salinity Refractometer
-Hold the refractometer downward at about a 45 degree angle.
-Face toward a light source and look through the eyepiece.
-View the scale.
Refractometer Scale With Refractometer Scale With Distilled WaterDistilled Water
Refractometer Scales With Refractometer Scales With Saline WaterSaline Water
Hands-on Lab Determining the Salinity of Water
Sample 1
Sample 2 Sample 3