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O'Donoghue, J.; Fitzsimmons, L. – Journal of Chemical Education, 2022
This work describes the design and testing of a low-cost light-emitting diode (LED)-based nephelometer for turbidity analysis. It also describes the use of this nephelometer for context-based learning (CBL) experiments designed for teaching laboratories. The LED nephelometer is simple, low-cost, and robust, providing similar results as a…
Descriptors: Chemistry, Science Instruction, Light, Measurement Equipment
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Liane Becker; Daniel C. Dreesmann – American Biology Teacher, 2024
This case study examines students' perception, motivation, and learning gain of a teaching unit featuring wireless sensors as tools to collect scientific data in the classroom. Students analyze data using the corresponding cellphone app, communicate findings to the class, and learn about a changing environment. Wireless sensors are produced for…
Descriptors: Student Attitudes, Student Motivation, Ecology, Educational Technology