Absorption of oxygen by alkaline pyrogallol

• Publisher: Elsevier Science
• Year: 1951
• Tongue: English
• Weight: 114 KB
• Volume: 251
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(51)90365-1

✦ Synopsis

STANDARDS NOTES 27I

known expansivity and which will not react with the sample. Uniform heating is provided by means of a bath containing alcohol, water, or a high-boiling oil, depending on the range of temperature to be studied.

The preparation and operation of the volume dilatometer may be described briefly as follows: A glass capillary is carefully calibrated and sealed to one end of a larger glass tube. The weighed sample is introduced into the tube, a glass bulb is added, and the tube is sealed. The bulb is used to prevent overheating of the sample during the sealing operation. The dilatometer is then weighed, evacuated, filled with mercury, reweighed, and then placed in a bath. As the bath is heated, the sample expands, forcing mercury up into the capillary where readings may be made. From the known weights and densities of the sample and the confining liquid and from the known expansivity of the confining liquid, the expansivity of the sample canbe calculated. Corrections must be applied for entrapped air bubbles, nonuniformity of the capillary, and the thermal expansion of glass.