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Direct linkGalleano, Monica; Boveris, Alberto; Puntarulo, Susana – Journal of Chemical Education, 2008
This article describes a simple and inexpensive laboratory exercise developed to understand the effect of pressure on phase equilibrium as described by the Clausius-Clapeyron equation. The only piece of equipment required is a pressure cooker adapted with a pressure gauge and a thermometer in the lid, allowing the measurement of the pressure and…
Descriptors: Climate, Science Instruction, Laboratory Experiments, Science Laboratories
Mitchell, Joseph D.; Petrov, Nikola P. – European Journal of Physics, 2009
We apply several physical ideas to determine the steady temperature distribution in a medium moving with uniform velocity between two infinite parallel plates. We compute it in the coordinate frame moving with the medium by integration over the "past" to account for the influence of an infinite set of instantaneous point sources of heat in past…
Descriptors: Physics, Climate, Motion, Science Instruction
Andrews, D. G. H. – European Journal of Physics, 2008
A simple student experiment investigating dependence on air pressure of the attenuation of alpha particles in air is described. An equation giving the pressure needed to absorb all alpha particles of a given energy is derived from the Bethe-Bloch formula. Results are presented for the attenuation of alpha particles from americium 241 and radium…
Descriptors: Science Experiments, Equations (Mathematics), Science Instruction, Molecular Structure
A Simple Calorimetric Experiment that Highlights Aspects of Global Heat Retention and Global Warming
Burley, Joel D.; Johnston, Harold S. – Journal of Chemical Education, 2007
In this laboratory experiment, general chemistry students measure the heating curves for three different systems: (i) 500 g of room-temperature water heated by a small desk lamp, (ii) 500 g of an ice-water mixture warmed by conduction with room-temperature surroundings, and (iii) 500 g of an ice-water mixture heated by a small desk lamp and by…
Descriptors: Climate, Energy, Change, Laboratory Experiments
Vachutka, J.; Grec, P.; Mornstein, V.; Caruana, C. J. – European Journal of Physics, 2008
The heating of tissues by diagnostic ultrasound can pose a significant hazard particularly in the imaging of the unborn child. The demonstration of the temperature field in tissue is therefore an important objective in the teaching of biomedical physics to healthcare professionals. The temperature field in a soft tissue model was made visible and…
Descriptors: Physics, Biophysics, Biomedicine, Climate
