r is but slightly compressible and for all practical purposes may be
considered non-compressible. The coefficient of compressibility ranges
from 0.000040 to 0.000051 per atmosphere at ordinary temperatures, this
coefficient decreasing as the temperature increases.

Table 11 gives the weight in vacuo and the relative volume of a cubic
foot of distilled water at various temperatures.

The weight of water at the standard temperature being taken as 62.355
pounds per cubic foot, the pressure exerted by the column of water of
any stated height, and conversely the height of any column required to
produce a stated pressure, may be computed as follows:

The pressure in pounds per square foot = 62.355 x height of column in
feet.

The pressure in pounds per square inch = 0.433 x height of column in
feet.

Height of column in feet = pressure in pounds per square foot / 62.355.

Height of column in feet = pressure in pounds per square inch / 0.433.

Height of column in inches = pressure in pounds per square inch x 27.71.

Height of column in inches = pressure in ounces per square inch x 1.73.

By a change in the weights given above, the pressure exerted and height
of column may be computed for temperatures other than 62 degrees.

A pressure of one pound per square inch is exerted by a column of water
2.3093 feet or 27.71 inches high at 62 degrees Fahrenheit.

Water in its natural state is never found absolutely pure. In solvent
power water has a greater range than any other liquid. For common salt,
this is approximately a constant at all temperatures, while with such
impurities as magnesium and sodium sulphates, this solvent power
increases with an increase in temperature.

TABLE 12

BOILING POINT OF WATER AT VARIOUS ALTITUDES

+--------------+----------------+-------------+---------------+
|Boiling Point | Altitude Above | Atmospheric | Barometer |
| Degrees | Sea Level | Pressure | Reduced |
| Fahrenheit | Feet | Pounds per | to 32 Degrees |
| | | Square Inch | Inches |
+--------------+----------------+-------------+---------------+
| 184 | 15221 | 8.20 | 16.70 |
| 185 | 14649 | 8.38 | 17.06 |
| 186 | 14075 | 8.57 | 17.45 |
| 187 | 13498 | 8.76 | 17.83 |
| 188 | 1293