1. Guide tube
2. Laser emitter A
3. Laser emitter B
4. Laser receiver A
5. Laser receiver B
6. Measuring cylinder
7. Back panel
8. Power socket
9. Laser control
10. Front panel
11. Timer
12. Power switch
13. Timer reset
Schematic of apparatus
Viscosity of castor oil
(Click graph to enlarge)
Features
Photoelectric timing
High accuracy
Ideal for for fluid mechanics teaching
Introduction
Viscosity coefficient is one of the important properties of liquid. Measurement of liquid viscosity coefficient using a falling ball can reveal related physical phenomena clearly. Normally, the measurement accuracy of the falling ball method is not high by using a manual stopwatch considering the existing parallax errors of the ball.
This apparatus is designed with the following benefits:
1. Using photoelectric sensor and electronic timer to avoid the parallax and timing errors caused by a stopwatch
2. Improved mechanical design to ensure precise falling trace of the ball
3. Using laser ranging to accurately measure both the fall time and fall distance to avoid the parallax error
Using this apparatus, the following experiments can be conducted:
1. Measure the viscosity coefficient of a liquid using falling ball method
2. Use a photoelectric sensor for timing experiment
3. Use a stopwatch to time a falling ball, and compare results with the photoelectric timing method
The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.
Main Specifications
| Description | Specifications |
| Electronic timer | Displacement range: 400 mm; resolution: 1 mm |
| Timing range: 250 s; resolution: 0.1 s | |
| Measuring cylinder | Volume: 1000 mL; height: 400 mm |
| Measurement error | <3% |
Part List
| Description | Qty |
| Stand Rack | 1 |
| Main Machine | 1 |
| Laser Emitter | 2 |
| Laser Receiver | 2 |
| Connection Wire | 1 |
| Measuring Cylinder | 1 |
| Small Steel Balls | diameter: 1.5, 2.0 and 2.5 mm, 20 each |
| Magnet Steel | 1 |
| Power Cord | 1 |
| Manual | 1 |
1. Guide tube
2. Laser emitter A
3. Laser emitter B
4. Laser receiver A
5. Laser receiver B
6. Measuring cylinder
7. Back panel
8. Power socket
9. Laser control
10. Front panel
11. Timer
12. Power switch
13. Timer reset
Schematic of apparatus
Viscosity of castor oil
(Click graph to enlarge)
