Математика. Числительные. Аристова В.М. - 37 стр.

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37
There are three other scales for measurings temperature: Reaumur's, Kelvin's
and Rankine's ones, but they are not widely used. All thermometres are similar but
with different scales. For daily civil purposes Fahrenheit and Celsius scales are
more convenient, for technical and scientific measurements Rankine and Kelvin
scales are in use.
The ratio of temperature units of the most frequently used scales is as fol-
lowing:
Fahrenheit tF =
9
5
tC+
+ 32=
9
4
tR
+ 32
Reaumur tR=
4
5
()tC
=
432
9
()tF −
Celsius tC=
532
9
()tF −
=
5
4
tR
To convert F°t into C°t: subtract 32 and multiply by 5/9;
to convert C°t into F°t: multiply by 9/5 and add 32;
to convert R°t into K°t the F°t scale is changed into C°t scale and then to Kelvin°.
F→ C → K
R → C → K
Fahrenheit (F) Centigrade (C)
Boiling point 212° 100°
194° 90°
176° 80°
158° 70°
140° 60°
122° 50°
104° 40°
86° 30°
68° 20°
50° 10°
Freezing point 32° 0°
14° -10°
0° -17·8°
Absolute Zero -457·67° -273·15°
Operations in Mathematics. Математические действия. 
    There are three other scales for measurings temperature: Reaumur's, Kelvin's
and Rankine's ones, but they are not widely used. All thermometres are similar but
with different scales. For daily civil purposes Fahrenheit and Celsius scales are
more convenient, for technical and scientific measurements Rankine and Kelvin
scales are in use.
    The ratio of temperature units of the most frequently used scales is as fol-
lowing:
                       9t + C       9 tR
    Fahrenheit tF =           + 32=      + 32
                          5          4
                     4( tC)   4( tF − 32)
    Reaumur tR=             =
                       5           9
                            5( tF − 32)   5tR
    Celsius           tC=               =
                                 9         4
    To convert F°t into C°t: subtract 32 and multiply by 5/9;
    to convert C°t into F°t: multiply by 9/5 and add 32;
    to convert R°t into K°t the F°t scale is changed into C°t scale and then to Kelvin°.
    F→ C → K
    R→C→K
                                            Fahrenheit (F)                  Centigrade (C)
Boiling point                   212°                             100°
                                194°                             90°
                                176°                             80°
                                158°                             70°
                                140°                             60°
                                122°                             50°
                                104°                             40°
                                86°                              30°
                                68°                              20°
                                50°                              10°
Freezing point                  32°                              0°
                                14°                              -10°
                                0°                               -17·8°
Absolute Zero                   -457·67°                         -273·15°




                 Operations in Mathematics. Математические действия.

                                                   37

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