EXERCISES FOR LESSON 2
1. The triple point of water is also called the equaphase of water, because water
A.
becomes a solid at 30,,F.
B.
coexists as liquid, solid and gas (vapor) at 0.01000,,C.
C.
coexists with other elements.
D.
coexists as liquid and a solid at various temperatures, above 40,,C.
2. What must be done to prevent the formation of gas pockets in the thermometer well
of the equaphase cell?
A.
turn the cell upside down
B.
por 3 cc of water into the well
C.
shake the cell gently
D.
use a vacuum pump to draw off any gas
3. Dry ice should be ground to what size?
A.
1" to 3"
B.
any size that will fit the well
C.
melt the ice first
D.
fine snow to 1/16" diameter
4. When testing (by comparison) two equiphase cells which of the following is true.
A. No temperature difference will be noted if both cells are free of impurities.
B. The cell with the lower temperature will be accepted.
C. If both cells have the same temperature reading, both cells will be disguarded.
5. When using the equiphase cell, thermometer leads should be tempered
A.
to prevent the leads from becoming to brittle.
B.
to prevent heat conduction through the leads down into the well.
C.
to prevent the leads from bending.
D.
to prevent the well from freezing.
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