Abstract:

Engineering education traditionally relies on hands-on laboratory work to ensure that students acquire a solid understanding of experimental devices, measurement techniques, and physical phenomena. However, current trends in higher education, driven by digitalisation, open learning, and internationalisation, require complementary teaching materials that facilitate access to experimental knowledge beyond the physical laboratory environment. In this context, audiovisual resources play an increasingly important role in supporting active and autonomous learning. This contribution presents the development and educational use of a set of four multilingual instructional videos, available in Spanish, English, French, and Arabic, designed to support an experimental practice in engineering thermodynamics focused on the volumetric properties of fluids. The videos provide a structured explanation of a laboratory experiment based on the analysis of pressure-volume-temperature (PVT) relationships, guiding students through the experimental setup, the measurement procedure, and the interpretation of the observed thermodynamic behaviour. Key concepts such as superheated vapour, liquid–vapour equilibrium, saturated liquid, and compressed liquid regions are addressed through visual explanation and experimental observation. The video materials have been conceived as a digital complement to the book “Engineering thermodynamics. Thermal equation of fluids by experimentation”, enabling students to prepare laboratory sessions in advance, reinforce theoretical concepts after the experiment, and engage in self-directed learning. The multilingual design enhances accessibility and supports their use in international educational contexts, particularly in engineering programmes delivered in universities in Spain and Morocco within the framework of an academic cooperation initiative. All videos are distributed through open-access platforms, including YouTube and the MERLOT (Multimedia Educational Resource for Learning and Online Teaching) digital repository, promoting their reuse as Open Educational Resources. Initial teaching experiences indicate that the integration of multilingual audiovisual materials improves students’ understanding of complex thermodynamic concepts, increases engagement with experimental activities, and contributes to the implementation of flexible and inclusive teaching methodologies in engineering education.

Keywords:

Open Educational Resources (OER), Multilingual Educational Videos, Experimental Learning, Thermodynamics Engineering, Pressure-Volume-Temperature (PVT).