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The purpose of this research was to investigate the viscosity in Yang oil which results from hydrogen adding. In the experiment of this research, the volume of oil at 200, 800, and 1400 mL was added to a 2000 mL-sized bottle. The samples of Yang oils were added hydrogen at 1 bar and were stood for 6, 15, and 24 h for 30 ºC. Finally, the viscosity of the treated oils was measured in accordance with ASTM D445. The results showed that the average viscosity of the oil before the hydrogen adding was 4.81 cSt. When treated, the average viscosities on each amount of oils were 4.93, 4.71, and 4.50 cSt, respectively. In addition, the average viscosities on each time were 4.69, 4.73, and 4.72 cSt, respectively. After being treated, the viscosity of the Yang oil was decreased with proper ratio of hydrogen to oil. In contrast, the viscosity was increase because the Yang oil was polymerizations. If the ratio of hydrogen to oil is high, the oil has a higher viscosity.
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