Nature of this Change

Since thermogravimetry is a dynamic technique, convection currents arising in a furnace will cause a continuous change in the gas atmosphere. The exact nature of this change further depends upon the furnace characteristics so that widely differing thermogravimetric data may be obtained from different designs of thermobalance. 

The fact that property differences between desiccated and soaked samples exist reinforce the concept that physical modifications are introduced into the polymer network by the moisture-temperature ageing. While the exact nature of this change... 

Within the last 15 years, the field of chemical kinetics, particularly gas phase kinetics, has undergone considerable change. One might almost be tempted to term this revolutionary. The nature of this change is that a large body of quantitative data has been accumulated about elementary unimolecular reactions and bimolecular reactions involving radicals,... 

Upon coordination to a metal center the electronic environment of the ligand obviously undergoes a change. Depending on the extent and nature of this change, the ligand may become susceptible to electrophilic or nucleophilic... 

Codeine-N-oxide sulphonic acid on heating with potassium chromate is converted to norcodeine sulphonic acid, which yields norcodeine on heating with superheated steam [352] (the nature of this change was not at first appreciated [339, 350]). Codeine-N-oxide likewise yields norcodeine and formaldehyde when oxidized with potassium chromate [352]. 

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