Researches on heat of combustion II: Internal lag and method of stirring in isothermally jacketed calorimeters

Abstract

After a discussion of the requirements to be met by the method of stirring used in liquid calorimeters for accurate heat measurements, a description is given of a calorimeter constructed on a new principle. The development of heat occurs in a cylinder which is somewhat smaller than the calorimeter vessel. Water is circulated between the two walls, where the thermometer is placed by means of a centrally fixed centrifugal pump. In this way, the actual wall temperature of the calorimeter‐vessel is measured; this is essential for the accurate calculation of the “radiation” correction. A simple method is described for determining the heat due to stirring. Finally, the required minimum duration of the main period is discussed.

Enthalpies of combustion of 1,1,4,4-tetramethylcyclodecane and of 1,1,5,5-tetramethylcyclodecane in the liquid state

“…Apparatus. The temperature of the isoperibol combustion bomb calorimeter (6)(7)(8)13) was measured with the platinum resistance thermometer and the Smith method No. 3 bridge described in ref 13. The calorimeter was calibrated with benzoic acid, National Bureau of Standards sample 39i, certified to have a specific internal energy of combustion of 26434 J g™1 under so-called certification conditions (12).…”

A Multi-Kilogram Capacity Calorimeter for Heterogenous Materials

“…Coops and Van Nes [14) devised the "flow pattern control shield" cited in [13) which we call the flow shield, for short. The design basis for closed isoperibol calorimeters (i.e .. those for which no reactants or products flow across the calorimeter boundary) has been reviewed elsewhere [13).…”

Precision two-compartment bomb calorimeter for combustion in fluorine

“…9 The principal points mentioned by these authors, especially concerning the optimization of heat transfer in the calorimeter vessel, received due consideration in the construction of the present system. 9 The principal points mentioned by these authors, especially concerning the optimization of heat transfer in the calorimeter vessel, received due consideration in the construction of the present system.…”