-5.33 |
| | 30 | -1.11 | -0.89 |
|Freezing Point | 32 | 0 | 0 |
|Maximum Density| | | |
| of Water | 39.1 | 3.94 | 3.15 |
| | 50 | 10 | 8 |
| | 75 | 23.89 | 19.11 |
| | 100 | 37.78 | 30.22 |
| | 200 | 93.33 | 74.67 |
|Boiling Point | 212 | 100 | 80 |
| | 250 | 121.11 | 96.89 |
| | 300 | 148.89 | 119.11 |
| | 350 | 176.67 | 141.33 |
+---------------+----------+----------+----------+

F = 9/5C+32deg. = 9/4R+32deg.

C = 5/9(F-32deg.) = 5/4R

R = 4/9(F-32deg.) = 4/5C

As a general rule thermometers are graduated to read correctly for total
immersion, that is, with bulb and stem of the thermometer at the same
temperature, and they should be used in this way when compared with a
standard thermometer. If the stem emerges into space either hotter or
colder than that in which the bulb is placed, a "stem correction" must
be applied to the observed temperature in addition to any correction
that may be found in the comparison with the standard. For instance, for
a particular thermometer, comparison with the standard with both fully
immersed made necessary the following corrections:

_Temperature_ _Correction_
40deg.F 0.0
100 0.0
200 0.0
300 +2.5
400 -0.5
500 -2.5

When the sign of the correction is positive (+) it must be added to the
observed reading, and when the sign is a negative (-) the correction
must be subtracted. The formula for the stem correction is as follows:

Stem correction = 0.000085 x n (T-t)

in which T is the observed temperature, t is the mean temperature of the
emergent column, n is the number of degrees of mercury column emergent,
and 0.000085 is the difference between the coefficient of expansion of
the mercury and that in the glass in the stem.

Suppose the observed temperature is 400 degrees and the thermometer is
immersed to the 200 degrees mark, so that 200 degrees of the mercury
column project into the air. The mean temperature of the emergent column
may be found by tying another thermometer on the stem with the bulb at
the middle of the emergent mercury column as in Fig. 12. Suppose this
mean temperature is 85 degrees,