Particles of polypropene, with densities approaching that of water were used as tracer in the water system for the investigation of the flow characteristics.
在观察水在管内的流动特性试验中，用聚丙烯颗粒作为示踪粒子，其密度与水非常相近。
2
The proposed method is more accurate than the qualitative investigation such as isotopic tracer.