|
| |
TM 9-254
5-6.
Temperature Conversion - Continued
Table 5-6. Temperature Conversion - Continued
Centigrade
Familiar temperature
or Celsius
Fahrenheit
Kelvin
Rankine
C
F
K
R
-6.7
20
266.46
479.7
-10
14
263.16
473.7
-12.2
10
260.96
469.7
-15
5
258.16
464.7
-17.8
0
255.36
459.7
-20
-4
253.16
455.7
-25
-13
248.16
444.7
-30
-22
243.16
437.7
-35
-31
238.16
428.7
-40
-40
233.16
419.7
b.
Formulas for converting from one temperature scale to another are listed in table 5-7.
Table 5-7. Formulas for Temperature Conversion
Temperature scales
Formulas
Celsius to Fahrenheit
° F = 9/5° C + 32°
Celsius to Kelvin
° K = °C + 273.1°
Fahrenheit to Celsius
° C = 5/9 (°F - 32)
Fahrenheit to Rankine
° R = °F + 459.58°
Section III. ANGULAR MEASUREMENT DATA
5-7.
Degree System.
a.
The degree system is a means of measuring and designating angles of arcs. The degree is 1/360 of a circle
or the value of the angle formed by dividing a right angle into 90 equal parts. Each degree is divided into 60 parts called
minutes and each minute is further divided into 60 parts called seconds
b.
In the use of fire control equipment, either degrees or mils may be used to designate angles of elevation and
azimuth. One degree equals 17.78 mils. One mil equals 0.056 degrees or 3 minutes 22.5 seconds. Refer to the
conversion chart in figure 5-1, for the approximate relative values of given angles of elevation and azimuth in degrees and
mils.
5-16
|
