This article the presents the results of a research on the change of electric voltage across a voltmeter, during the solution of a wheat of salt. It could be a stimulus for subsequent developments, even involving the class and the chemistry teacher in the project area of the biennium of the technical industrial institutes. […]
The 1957 Nobel Prize awarded to Tsung Dao Lee and Cheng Ning Yang aroused the interest of the public. The article aims to illustrate the importance of the work of Lee and Yang in a simple way, comprehensible to lay people with little or no knowledge of modern physics. […]