The settling velocity of such aggregates and primary soil particles is of basic importance to the processes of sediment transport and deposition in water. A great EEI could be to check factors influencing settling velocity. A bottom withdrawal tube technique is commonly used for the direct measurement of the settling velocity distribution of soil aggregates or particles of different sizes that settle collectively. The capability of a sunscreen to protect the user from UV radiation is outlined as the Sun Protection Factor . Some good EEIs have been carried out on wanting on the effectiveness of sunscreens in blocking totally different wavelengths. It could also be exhausting to get a laboratory source of UV so you would do it with simply the Sun. I’ve seen some accomplished with light-delicate paper to measure the sunlight getting via a thin film.