DESIGN AND DEVELOPMENT OF DEVICE FOR MEASURING VISCOSITY COEFFICIENT OF LIQUID BY VELOCITY METHOD

To address the challenges in university physics experiments such as the difficulty in measuring the viscosity of liquids, low success rates, and narrow measurable ranges, the author designed and constructed a device to measure the viscosity of liquids using the flow rate method based on theoretical foundations such as Bernoulli's equation. This device indirectly measures the viscosity of the liquid by measuring the flow rate of the liquid under test within a certain period of time. By comparing the viscosities of castor oil measured by the flow rate method and the falling ball method, as well as the viscosities of soy sauce and pure water measured by the flow rate method with their standard viscosities, we believe that the flow rate method offers a simpler experimental process, more reliable data, and a broader measurable range. This study enriches the methods for measuring the viscosity of liquids.