MEASURING INSTRUMENT FOR LIQUID VISCOSITY COEFFICIENT BY THE METHOD OF DROPPING BALL

Product Description

MEASURING INSTRUMENT FOR LIQUID VISCOSITY COEFFICIENT BY THE METHOD OF DROPPING BALL

Description:
Coefficient of viscosity is one of the most important properties of liquid and has significant application in many fields such as production technique and medicine. Measurement of liquid viscosity coefficient with falling-sphere method is suitable for experiment and teaching of freshman and sophomore because its physical phenomenonis very clear, the concept is well defined and it needs much operating and practice. The old method has poor accuracy in measuring rate of fall because it is limited by many factors such as manual timer reading, parallax and off-center of falling ball. This measuring apparatus has following features: 
1. Timing is done with photoelectric pickup and single-chip microcomputer, so the parallax and response error of manual timing with stopwatch is avoided. Measuring of falling-sphere speed is accurate. By doing it students will master a new method of timing, speed measurement and counting.
2. The apparatus is equipped with adjustment mechanism to adjust levelness of base plate and verticality of stand bar and a falling-ball guide tube, which ensures that the ball falls in the center of the measurement cylinder. 
3. Falling time and distance can be accurately measured with two parallel laser beams. Manual timing can be compared with laser-beam timing with this apparatus.
EXPERIMENTS:
1. Learning how to measure coefficient of viscosity of liquid with falling-sphere method
2. Learning the experimental method of timing with laser, light-sensitive receiver and SCM.
3. Learning how to measure time elapsed by falling sphere with a stopwatch, and compare the timing result to that with laser photoelectric timing method.

Details: