cepted) and its specific
heat is the basis for measurement of the capacity of heat absorption of
all other substances. From the definition, the specific heat of water is
the number of British thermal units required to raise one pound of water
one degree. This specific heat varies with the temperature of the water.
The generally accepted values are given in Table 13, which indicates the
values as determined by Messrs. Marks and Davis and Mr. Peabody.

TABLE 13

SPECIFIC HEAT OF WATER AT VARIOUS TEMPERATURES

+----------------------+--------------------------------+
| MARKS AND DAVIS | PEABODY |
| From Values of | From Values of |
| Barnes and Dieterici | Barnes and Regnault |
+-----------+----------+---------------------+----------+
|Temperature| Specific | Temperature | Specific |
+-----------+ Heat +----------+----------+ Heat |
| Degrees | | Degrees | Degrees | |
|Fahrenheit | |Centigrade|Fahrenheit| |
+-----------+----------+----------+----------+----------+
| 30 | 1.0098 | 0 | 32 | 1.0094 |
| 40 | 1.0045 | 5 | 41 | 1.0053 |
| 50 | 1.0012 | 10 | 50 | 1.0023 |
| 55 | 1.0000 | 15 | 59 | 1.0003 |
| 60 | 0.9990 | 16.11 | 61 | 1.0000 |
| 70 | 0.9977 | 20 | 68 | 0.9990 |
| 80 | 0.9970 | 25 | 77 | 0.9981 |
| 90 | 0.9967 | 30 | 86 | 0.9976 |
| 100 | 0.9967 | 35 | 95 | 0.9974 |
| 110 | 0.9970 | 40 | 104 | 0.9974 |
| 120 | 0.9974 | 45 | 113 | 0.9976 |
| 130 | 0.9979 | 50 | 122 | 0.9980 |
| 140 | 0.9986 | 55 | 131 | 0.9985 |
| 150 | 0.9994 | 60 | 140 | 0.9994 |
| 160 | 1.0002 | 65 | 149 | 1.0004 |
| 170 | 1.0010 | 70 | 158 | 1.0015 |
| 180 | 1.0019 | 75 | 167 | 1.0028 |
| 190 | 1.0029 | 80 | 176 | 1.0042 |
| 200 | 1.0039 | 85 | 185 | 1.0056 |
| 210 | 1.0052 | 90 | 194 | 1.0071 |
| 220 | 1.007 | 95 | 203 | 1.0086 |
| 230 | 1.009 | 100 | 212 | 1.0101 |
+-----------+----------+----------+----------+----------+