Physics – Physics Education
Scientific paper
2011-06-12
Physics
Physics Education
16 pages, 8 figures. Partially accepted in American Journal of Physics (2011)
Scientific paper
This article demonstrates an undergraduate experiment for the determination of specific heat capacities of various solids based on a calorimetric approach, where the solid vaporizes a measurable mass of liquid nitrogen. We demonstrate our technique for the metals copper and aluminum, the semi-metal graphite and also present the data in relation with Einstein's model of independent harmonic oscillators and the more accurate Debye model based on vibrational modes of a continuous crystal. Furthermore, we elucidate an interesting material property, the Verwey transition in magnetite occurring around 120-140 K. We also demonstrate that the use of computer based data acquisition and subsequent statistical averaging helps reduce measurement uncertainties.
Anwar Muhammad Sabieh
Mahmood Waqas
Zia Wasif
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