The absolute centigrade temperature T is thence inferred from the gas equation (8) R = pv/T = povo/273, which, with p = 2440, v =5, p o = 1, vo =700, makes T =4758, a temperature of 4485° C. or 8105° F.
Joule inferred from them that the mechanical equivalent of heat is probably about 772 foot-pounds, or, employing the centigrade scale, about 1390 foot-pounds.
Temperature on the Centigrade Scale.
The two standards, the cubic inch and the cubic decimetre, may not be strictly comparable owing to a difference in the normal temperature (Centigrade and Fahrenheit scales) of the two units of extension, the metre and the yard.
This unit is taken as being 4.180 joules per gramme-degree-centigrade on the scale of the platinum thermometer, corrected to the absolute scale as explained in the article Thermometry, Which Has Been Shown To Be Practically Equivalent To The Hydrogen Scale.
Processes of annealing, or very gradual cooling, are intended to relieve these strains, but such processes are only completely effective when the cooling, particularly through those ranges of temperature where the glass is just losing the last traces of plasticity, is extremely gradual, a rate measured in hours per degree Centigrade being required.
(iii.) The instrument should have no temperature correction; this is a good quality of electrostatic instruments, but in all voltmeters of the electrokinetic type which are wound with copper wire an increase of one degree centigrade in the average temperature of that wire alters the resistance by 0.4%, and therefore to the same extent alters the correctness of the indications.
System of expression in ergs per gramme-degree-centigrade, or " calorie," is the most appropriate, as being independent of the value of gravity.
Adopting the centigrade scale, this gives 1390.846 foot-pounds.
The following table contains the most probable values for a few of these points which have been determined with the greatest care or frequency: Table of Boiling-Points at Atmospheric Pressure on Centigrade Scale Alphabetical Index of Symbols Empirical constants in formulae; section 14.
Relation Of Surface-Tension To Temperature It appears from the experiments of Brunner and of Wolf on the ascent of water in tubes that at the temperature t° centigrade T =75.20 (I -0.00187t) (Brunner); =76 08 (i-o o02t-Po ooOo0415t 2), for a tube .02346cm.diameter (Wolf); = 77.34(1 -o oo181t), for a tube 03098 cm.
The formulae show the number of cubic centimetres of gas absorbed by i litre of sea-water; t indicates the temperature in degrees centigrade and CI the salinity as shown by the amount of chlorine per mille: 02 = 10.291 - 0 .
In the measurement of temperature the Fahrenheit scale is still followed for imperial standards, and the Centigrade scale for metric standards.
Employing this method, Callendar finds S = 0.497 for steam at one atmosphere Temperature Centigrade FIG.