Volume ? 2.784 ? (Temperature + 273)
Resulting volume = ------------------------------------
Pressure - tension
As an example, we will suppose that it is desired to enclose in the
apparatus referred to on p. 45, a volume of air, which, when dry (at 0°
C. and 760 mm.), shall measure 100 c.c., whilst the actual temperature
is 15° C., and the pressure 750 mm.
The second formula is the one to be used, and we get 108.7 c.c.
100 c.c.?2.784?288
Required volume = ----------------------
750-12.7
80179.2
= -------
737.3
= 108.7 c.c.
FOOTNOTES:
[4] 100-35.6 = 64.4.
CHAPTER V.
WEIGHING AND MEASURING.
~Weighing.~--The system of weights and measures which we have adopted is
the French or metric system; in this the gram (15.43 grains) is the unit
of weight; the only other weight frequently referred to is the
milligram, which is 0.001, or 1/1000 gram. The unit of volume is the
cubic centimetre, which is approximately the volume of 1 gram of water,
and which thus bears to the gram the same relation as grain-measures
bear to grains. It is usual to write and even pronounce cubic centimetre
shortly as c.
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