Abstract
We built a magnetic stirrer to mix tea and honey and developed a method to determine the homogeneity of the mixture based on the variation of light intensity of a laser beam with time due to its scattering by the mixture. The addressed problem was that of mixing tea and honey as fast as possible with a power limitation of one single 1.5 V battery, following the statement of Problem 15 of the 9th International Physicists’ Tournament. The influence of temperature and honey concentration on the total time of mixing was studied through the performance of several experiments reported here. In the best configuration of parameters, the total mixture occurs in less than 2 s, while in the worst configuration, the time necessary reaches 10 s. Results validate the magnetic stirrer as a proper device for mixing tea with honey and light attenuation as an excellent physical property for investigating the homogeneity of the mixture of the honey in tea. Supplementary investigations were made exploring the influence of adding sugar and or a slice of lemon to the tea.
Highlights
Tea is undoubtedly among the most consumed drinks in the world
Direct experience shows that mixing tea with honey may sometimes not be the easiest task: given the fluids’ low apparent diffusivity [1], it is often necessary to employ considerable effort into the stirring process for the complete mixture to occur
1 In this paper we report the solution of for Problem 15 of the 9th International Physicists’ Tournament, as can be found in: http:// 2017.iptnet.info/problems/
Summary
Tea is undoubtedly among the most consumed drinks in the world. Variations may occur due to personal taste, tea is often consumed with a sweetener. We will consider a common choice: tea sweetened with honey. Direct experience shows that mixing tea with honey may sometimes not be the easiest task: given the fluids’ low apparent diffusivity [1], it is often necessary to employ considerable effort into the stirring process for the complete mixture to occur. It may be useful to develop a stirrer device, which automates such task. Two questions naturally arise: first, what is the optimum design of such device? How can one be sure when the honey is totally mixed in tea? These are the main questions addressed in this paper Two questions naturally arise: first, what is the optimum design of such device? And secondly, how can one be sure when the honey is totally mixed in tea? These are the main questions addressed in this paper
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