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8. One cannot expect a complicated problem like that of using solar
energy to be solved in a year or so.
9. Some kinds of paint allow the metal to stay under water for several
years without being repainted.
10. It is the gravitation that makes the satellites move round the
earth.
11. The plasticity of steel, whether at room temperature or at elevated
temperatures, allows it to be worked either hot or cold.
12. Different gases might cause the currents to differ by altering the
surface of the metal either by combining with it, or by condensing on
its surface.
13. In the deformation of a metal, we have seen slip take place along
definite crystallographic planes in definite directions.
14. On theoretical grounds one would expect the minimum
frequency for ionization to be connected with the ionization potential,
as found by Frank and Hertz’s method or from spectral considerations.
There is however the possibility that the molecule might be ionized in
stages.
15. The kinetic theory of gases assumes a gas to be made up of
particles (the molecules) moving about with random motion.
16. Complicated additivity rules are extremely useful in enabling
one to calculate in advance the approximate value of the refractivity of
a chemical compound whose dispersion has not been measured.
17. We might synthesize water by allowing hydrogen and oxygen to
combine, which they do very readily.
18. X-rays have been of tremendous assistance to the engineer in
enabling him to work by knowledge instead of by rule of thumb.
19. During his lifetime Roentgen had the satisfaction of seeing his
discovery become a major diagnostic aid in the field of medicine.
20. In Europe the twelfth century saw the first canals cut by the
Dutch, but it was not till the fourteenth century that the invention of
locks in Italy made inland navigation possible on any large scale.
21. Chekhov soon discovered that it was impossible to make the
reader draw the right moral from his stories.
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