JOURNAL OF CHEMICAL EDUCATION
MODIFIED DUMAS BULB EXPERIMENT T. J. PHILLIPS Evansville College, Evansville, Indiana
RATHERthan have the student break the Dumas Bulb under water and determine the volume from the weight of water taken into the bulb,' we have found that the student can determine the volume just as accurately by displacing water. The water level of a glass cylinder is marked, the bulb immersed, and the new water level 1 Dnrrws, F.,J. H. MATHEWS AND J. W. WILLIMIS: ''Experi-
marked. The volume change can be measured by running in water from a buret. From the known density of the glass (we have our students determine this from the small piece removed when the bulb was sealed) and the weight of the bulb, the interior volume is calculated. This method eliminates the possibility of losing small pieces of glass when the bulb is broken under water and mental Physical Chemistry," McGraw-Hill Book Company, also the necessity for making a "bubble correction" in case of incomplete filling. Ine., 1941, p. 303.
