ABSTRAKPercobaan Viskositas bertujuan untuk menentukan koefisien kekentalan zat cair dengan menggunakan hukum Stokes. Eksperimen tersebut menggunakan bola pejal dengan fluida yang ditempatkan dalam tabung kaca. Fluida yang dicari viskositasnya adalah minyak pelumas kendaraan bermotor atau yang biasa dikenal dengan sebutan oli. Percobaan yang merupakan salah satu mata praktikum di Laboratorium Fisika Dasar ini merupakan salah satu eksperimen yang menjadi dasar untuk melatihkan kemampuan alat ukur mahasiswa. Dalam metode pengukuran viskositas berdasarkan Hukum Stokes, dilakukan peluncuran bola pejal dalam suatu fluida yang ditempatkan dalam tabung. Penelitian ini dilakukan untuk mengetahui kosntruksi ideal set alat viskositas untuk persamaan hukum stokes, agar diperoleh data yang akurat terkait nilai koefisien viskositas. Dalam hal ini Sample fluida yang digunakan oli (SAE 10W -40). Metode penelitian yang digunakan adalah pengumpulan data berdasarkan eksperimen. Dari data yang terkumpul telah dihasilkan kesimpulan tetntang konstruksi tabung yang tepat dalam pengambilan data untuk menghasilkan data yang mendekati nilai referensi koefisien viskositas oli, dengan kondisi yang paling efektif dan efisien bagi praktikan. ABSTRACTThe Viscosity experiment aims to determine the viscosity coefficient of liquid using Stokes' law. This experiment uses solid balls with fluid placed in a glass tube. The fluid that is sought for its viscosity is motor vehicle lubricating oil or commonly known as oil. This eksperiment, which is one of the practicums at the Basic Physics Labolatory that will be the basic for students to train their meassuring abbilities. The method for measuring viscosity is based on the Stokes Law, a solid ball dispatch into a fluid placed in a tube. This study was conducted to determine the ideal construction of viscosity tubes for stokes' method, in order to obtain accurate data regarding the value of the viscosity coefficient. In this case the fluid sample was used oil (SAE 10W -40). The research method that used is data collection based on experiments. From the collected data, conclusions have been made regarding the proper tube construction in retrieving data to produce data that approaches the oil viscosity coefficient reference value, with the most effective and safe conditions for the practitioner.

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This study describes the process of designing, manufacturing and the performance of Do It Yourself (DIY) electrodes for Soil Resitivity Measurement (SRM) practicum in the Geophysical Geology course. The aim is to produce electrodes that can be used with the Geo Tester tool from the Fluke 1623. The method used was the Research and Development method. the required electrode had been analyzed prior to the idea of making make your own electrode was created. The electrodes were designed in such a way as to consider the level of accuracy, convenience, safety and economics. The results showed that the DIY electrode was made well, the limited trial of data collection using the Schlumberger and Wenner configuration methods resulted in data error values ​​of 2.43% and 4.1%, respectively. The results were much smaller than the accepted minimum error threshold, namely 20%. The validation results from DIY electrode users (Data Collection Team) and Earth Physicist lecturers gave an average rating of 3.8 out of a scale 4. Thus, DIY eceltrodes can be used in practical for Geophysical Geology lectures in the Earth and Space Laboratory