A Study of Oil Viscosity Mental Model

International Seminar on Mathematics, Science, and Computer Science Education 2016

数学;自然科学;计算机科学

Albaiti^1 ; Liliasari^2 ; Sumarna, Omay^2 ; Martoprawiro, Muhamad Abdulkadir^3

Graduate School, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung

40154, Indonesia^1

Department of Chemistry Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung

40154, Indonesia^2

Department of Chemistry, Institut Teknologi Bandung, Ganesa Street No. 10, Bandung

40132, Indonesia^3

关键词: Chemistry teachers;    Intermolecular attractive forces;    London forces;    Microscopic levels;    Oil viscosity;    Symbolic level;    Synthetic oil;    Viscosity data;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/812/1/012030/pdf
DOI  :  10.1088/1742-6596/812/1/012030

来源: IOP

【 摘 要 】

There is no study regarding on how to learn viscosity of the liquid (e.g. oil) by interconnecting macroscopic, sub-microscopic and symbolic levels. Therefore, the purpose of this research was to study the mental model of the oil viscosity. Intermolecular attractive force of oil constituent on the sub-microscopic level is depicted in the form of mental models. In this research, the viscosity data for some types of oil was measured by using Hoppler method. Viscosity of mineral oil SAE 20W-50, mineral oil SAE 15W-40 and synthetic oil SAE 10W-40 were 1.75, 1.31, and 1.03 Pa s, and the densities of these oils were 908.64, 885.04, and 877.02 kg/m3, respectively. The results showed that the greater density of the mineral oil that is assumed to be composed of linear chains of hydrocarbons, the longer the chain of hydrocarbon linear. Consequently, there are stronger the London force and greater the oil viscosity. The density and viscosity of synthetic oil are lower than that of both mineral oils. Synthetic oil structurally forms polymers with large branching. This structure affects a lower synthetic oil viscosity. This study contributes to construct a mental model of pre-service chemistry teachers.