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large graduated cylinders
BACKGROUND
In waters where a large amount of suspended sediments are present,
the density also increases. This is most notable in major rivers
such as the Nile, Mississippi, and Amazon. In the oceans, at the
junction between the continental shelves and the continental slopes
(which lead to abyssal plains), large, dense, sediment-water mixtures
form turbidity currents and flow down slope.
When water bodies with different densities contact each other,
some mixing may occur, but it often occurs quite slowly or not
at all. This can be observed where fresh water flows out into
the ocean and remains on top of the denser sea water. Along ice
caps and glacial margins, rivers of dense, cold water flow out
and sink into the oceans relatively warmer (and therefore less
dense) sea water. These are known as cold water currents. Many
swimmers in lakes have experienced hot/cold spots in lakes and
rivers where water of different density is entering the lake in
a coherent manner as a current.
MATERIALS
Each group of students will need the following: three (3) styrofoam
(or paper if you are protecting the ozone layer) cups of 8 ounce
capacity, clock or watch with a second hand, 25 ml graduated cylinder,
two 100 ml graduated cylinders, ice-cold water (mixture of ice
and water; drain off water when you need it), red, blue, and yellow
food color, 125 ml of mineral oil, 60 ml of tap water, 1/2 teaspoon
(2.5 ml) measure, 1 medicine dropper, clay (do not use plasticene
modeling clay, use a clay soil source instead; in desperation
Kaopectate may be used), 15 grams of salt (sodium chloride).
 Please Contact Us to discuss your large graduated cylinders needs. You design it, we build it.
large
graduated cylinders
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