The Experts below are selected from a list of 2073 Experts worldwide ranked by ideXlab platform
Stephen W Hughes - One of the best experts on this subject based on the ideXlab platform.
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investigating sea level rise due to global warming in the teaching laboratory using Archimedes Principle
Institute for Future Environments; Science & Engineering Faculty, 2015Co-Authors: Stephen W Hughes, Darren PearceAbstract:A teaching laboratory experiment is described that uses Archimedes’ Principle to precisely investigate the effect of global warming on the oceans. A large component of sea level rise is due to the increase in the volume of water due to the decrease in water density with increasing temperature. Water close to 0 °C is placed in a beaker and a glass marble hung from an electronic balance immersed in the water. As the water warms, the weight of the marble increases as the water is less buoyant due to the decrease in density. In the experiment performed in this paper a balance with a precision of 0.1 mg was used with a marble 40.0 cm3 and mass of 99.3 g, yielding water density measurements with an average error of -0.008 ± 0.011%.
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investigating sea level rise due to global warming in the teaching laboratory using Archimedes Principle
European Journal of Physics, 2015Co-Authors: Stephen W Hughes, Darren PearceAbstract:A teaching laboratory experiment is described that uses Archimedes' Principle to precisely investigate the effect of global warming on the oceans. A large component of sea level rise is due to the increase in the volume of water due to the decrease in water density with increasing temperature. Water close to 0 degrees C is placed in a beaker and a glass marble hung from an electronic balance immersed in the water. As the water warms, the weight of the marble increases as the water is less buoyant due to the decrease in density. In the experiment performed in this paper a balance with a precision of 0.1 mg was used with a marble 40.0 cm(3) and mass of 99.3 g, yielding water density measurements with an average error of -0.008 +/- 0.011%.
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a technique for fast and accurate measurement of hand volumes using Archimedes Principle
Australasian Physical & Engineering Sciences in Medicine, 2008Co-Authors: Stephen W Hughes, Jaclyn LauAbstract:A new technique for measuring hand volumes using Archimedes Principle is described. The technique involves the immersion of a hand in a water container placed on an electronic balance. The volume is given by the change in weight divided by the density of water. This technique was compared with the more conventional technique of immersing an object in a container with an overflow spout and collecting and weighing the volume of overflow water. The hand volume of two subjects was measured. Hand volumes were 494±6 ml and 312±7 ml for the immersion method and 476±14 ml and 302±8 ml for the overflow method for the two subjects respectively. Using plastic test objects, the mean difference between the actual and measured volume was -0.3% and 2.0% for the immersion and overflow techniques respectively. This study shows that hand volumes can be obtained more quickly than the overflow method. The technique could find an application in clinics where frequent hand volumes are required.
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measuring liquid density using Archimedes Principle
Physics Education, 2006Co-Authors: Stephen W HughesAbstract:A simple technique is described for measuring absolute and relative liquid density based on Archimedes' Principle. The technique involves placing a container of the liquid under test on an electronic balance and suspending a probe (e.g. a glass marble) attached to a length of line beneath the surface of the liquid. If the volume of the probe is known, the density of liquid is given by the difference between the balance reading before and after immersion of the probe divided by the volume of the probe. A test showed that the density of water at room temperature could be measured to an accuracy and precision of 0.01 ± 0.1%. The probe technique was also used to measure the relative density of milk, Coca-Cola, fruit juice, olive oil and vinegar.
Darren Pearce - One of the best experts on this subject based on the ideXlab platform.
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investigating sea level rise due to global warming in the teaching laboratory using Archimedes Principle
Institute for Future Environments; Science & Engineering Faculty, 2015Co-Authors: Stephen W Hughes, Darren PearceAbstract:A teaching laboratory experiment is described that uses Archimedes’ Principle to precisely investigate the effect of global warming on the oceans. A large component of sea level rise is due to the increase in the volume of water due to the decrease in water density with increasing temperature. Water close to 0 °C is placed in a beaker and a glass marble hung from an electronic balance immersed in the water. As the water warms, the weight of the marble increases as the water is less buoyant due to the decrease in density. In the experiment performed in this paper a balance with a precision of 0.1 mg was used with a marble 40.0 cm3 and mass of 99.3 g, yielding water density measurements with an average error of -0.008 ± 0.011%.
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investigating sea level rise due to global warming in the teaching laboratory using Archimedes Principle
European Journal of Physics, 2015Co-Authors: Stephen W Hughes, Darren PearceAbstract:A teaching laboratory experiment is described that uses Archimedes' Principle to precisely investigate the effect of global warming on the oceans. A large component of sea level rise is due to the increase in the volume of water due to the decrease in water density with increasing temperature. Water close to 0 degrees C is placed in a beaker and a glass marble hung from an electronic balance immersed in the water. As the water warms, the weight of the marble increases as the water is less buoyant due to the decrease in density. In the experiment performed in this paper a balance with a precision of 0.1 mg was used with a marble 40.0 cm(3) and mass of 99.3 g, yielding water density measurements with an average error of -0.008 +/- 0.011%.
Untung Nugroho Harwanto - One of the best experts on this subject based on the ideXlab platform.
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developing and evaluating physics teaching material with algodoo phun in virtual environment Archimedes Principle
International Journal of Innovation in Science and Mathematics Education, 2015Co-Authors: Harun Celik, Ugur Sari, Untung Nugroho HarwantoAbstract:This study examines pre-service science teachers’ perception on computer-based learning (CBL) experiences through virtual physics program. An Algodoo program and smart board was used in this study in order to realize the virtual environment. We took one specific physic topic for the 10th grade according to the physics curriculum in Turkey. Archimedes` Principle is one of the most important and fundamental concepts needed in the study of fluid mechanics. We decided to design a simple virtual simulation in Algodoo in order to explain the Archimedes’ Principle easier and enjoyable. Smart board was used in order to make virtual demonstration in front the students without any real experiment. There were 37 participants in this study who are studying pedagogical proficiency at Kirikkale University, Faculty of Education in Turkey. Case study method was used and the data was collected by the researchers. The questionnaire consists of 28 items and 2open-ended questions that had been developed by Akbulut, Akdeniz & Dincer (2008). The questionnaire was used to find out the teachers`perceptions toward Algodoo for explaining the Archimedes’ Principles. The result of this research recommends that using Algodoo program in physics teaching has positive impact and can improve the students’ understanding.
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evaluating and developing physics teaching material with algodoo in virtual environment Archimedes Principle
2015Co-Authors: Harun Celik, Untung Nugroho HarwantoAbstract:This study examines pre-service physics teachers' perception on computer-based learning (CBL) experiences through a virtual physics program. An Algodoo program and smart board was used in this study in order to realize the virtual environment. We took one specific physics topic for the 10 th grade according to the physics curriculum in Turkey. ArchimedesPrinciple is one of the most important and fundamental concepts needed in the study of fluid mechanics. We decided to design a simple virtual simulation in Algodoo in order to explain the Archimedes' Principle easier and enjoyable. A smart board was used in order to make virtual demonstration in front the students without any real experiment. There were 37 participants in this study who are studying pedagogical proficiency at Kirikkale University, Faculty of Education in Turkey. A case study method was used and the data was collected by the researchers. The questionnaire consists of 28 items and 2 open-ended questions that had been developed by Akbulut, Akdeniz and Dincer (2008). The questionnaire was used to find out the teachersperceptions toward Algodoo for explaining the Archimedes' Principles. The result of this research recommends that using the simulation program in physics teaching has a positive impact and can improve the students' understanding.
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developing and evaluating physics teaching material with algodoo phun in virtual environment Archimedes Principle
The Eurasia Proceedings of Educational and Social Sciences, 2014Co-Authors: Harun Celik, Ugur Sari, Untung Nugroho HarwantoAbstract:This study examines pre-service teachers’ computer-based learning (CBL) experiences through virtual physics program, Algodoo (phun). We took one specific physic topic for the 10 th grade according to the physics curriculum in Turkey. Archimedes` Principle is one of the most important basic concepts needed in the study of fluid mechanics. We decided to design a simple virtual simulation in Algodoo (phun) related to Archimedes’ Principle. Smart board was used in order to make clear demonstration. There were 37 participants in this study who are studying pedagogical proficiency at Kirikkale University, Faculty of Education in Turkey. Case study method was used and the data was collected by the researchers. The questionnaire consists of 28 items and 2 open-ended questions that had been developed by Akbulut, Akdeniz & Dincer (2008). The questionnaire was used to find out the teachers` perceptions toward Algodoo for teaching physics. The result of this research recommends that using Algodoo program in physics teaching has positive impact and can improve the students’ understanding.
D. F. Parsons - One of the best experts on this subject based on the ideXlab platform.
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Ice Particles Sink below the Water Surface Due to a Balance of Salt, van der Waals, and Buoyancy Forces
2018Co-Authors: P. Thiyam, J. Fiedler, S. Y. Buhmann, C. Persson, I. Brevik, M. Boström, D. F. ParsonsAbstract:According to the classical Archimedes’ Principle, ice floats in water and has a fraction of its volume above the water surface. However, for very small ice particles, other competing forces such as van der Waals forces due to fluctuating charge distributions and ionic forces due to salt ions and charge on the ice surface also contribute to the force balance. The latter crucially depends on both the pH of the water and the salt concentration. We show that a bulge in the air–water interface due to interaction of surface tension with the rising ice particle becomes significant when the particle radius is greater than 50–100 μm. The role of these forces in governing the initial stages of ice condensation has never been considered. Here, we show that small ice particles can only form below an exclusion zone, from 2 nm (in high salt concentrations) up to 1 μm (in pure water at pH 7) thick, under the water surface. This distance is defined by an equilibrium of upward buoyancy forces and repulsive van der Waals forces. Ionic forces due to salt and ice surface charge push this zone further down. Only after growing to a radius larger than 10 μm, will the ice particles eventually float toward the water surface in agreement with the simple intuition based on Archimedes’ Principle. Our result is the first prediction of observable repulsive van der Waals forces between ice particles and the water surface outside a laboratory setting. We posit that it has consequences on the biology of ice water as we predict an exclusion zone free of ice particles near the water surface which is sufficient to support the presence of bacteria
Parsons, Drew F. - One of the best experts on this subject based on the ideXlab platform.
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Ice particles sink below the water surface due to a balance of salt, van der Waals and buoyancy forces
American Chemical Society (ACS), 2018Co-Authors: Thiyam Priyadarshini, Fiedler Johannes, Buhmann, Stefan Yoshi, Persson Clas, Brevik, Iver Håkon, Boström Mathias, Parsons, Drew F.Abstract:According to the classical Archimedes’ Principle, ice floats in water and has a fraction of its volume above the water surface. However, for very small ice particles, other competing forces such as van der Waals forces due to fluctuating charge distributions and ionic forces due to salt ions and charge on the ice surface also contribute to the force balance. The latter crucially depends on both the pH of the water and the salt concentration. We show that a bulge in the air–water interface due to interaction of surface tension with the rising ice particle becomes significant when the particle radius is greater than 50–100 μm. The role of these forces in governing the initial stages of ice condensation has never been considered. Here, we show that small ice particles can only form below an exclusion zone, from 2 nm (in high salt concentrations) up to 1 μm (in pure water at pH 7) thick, under the water surface. This distance is defined by an equilibrium of upward buoyancy forces and repulsive van der Waals forces. Ionic forces due to salt and ice surface charge push this zone further down. Only after growing to a radius larger than 10 μm, will the ice particles eventually float toward the water surface in agreement with the simple intuition based on Archimedes’ Principle. Our result is the first prediction of observable repulsive van der Waals forces between ice particles and the water surface outside a laboratory setting. We posit that it has consequences on the biology of ice water as we predict an exclusion zone free of ice particles near the water surface which is sufficient to support the presence of bacteria. © 2018 American Chemical Societ
