Question

How can we find if the water is fresh or dirty without using a microscope?

Answer 1

We need to understand various measures that can be used to test if the given sample of water is fresh or dirty without using a microscope. Fresh water may be defined as water that can be used for various purposes such as drinking since it is likely to be free of impurities. Water that is dirty and no longer translucent is typically described as murky, but there is another word that is used to describe the same occurrence that is highly frequent and undisputed in its definition. Filthy water is unfit to drink because it is dirty, filthy, unsafe, and polluted.

Complete answer:
Without using a microscope, water can be declared as fresh or dirty by checking the turbidity of the water and by filtration.
Turbidity is a measurement of a liquid's relative clarity and is an essential component in water quality. When a light is flashed through a water sample, it is a measurement of the quantity of light dispersed by material in the water. Water with turbidity is cloudy or opaque. Pathogens can find food and refuge in turbidity. The sources of excessive turbidity, if not eliminated, might promote pathogen renewal in the water. Hence, if the water appears to be turbid, it is likely to be dirty.
Filtration can be used to determine whether water is clean or unclean. Take a beaker, funnel, and filter paper and set them aside. Place the funnel with filter paper on the beaker. Pour the water over the filter paper in the funnel and let it aside for five minutes. If there are any dust particles on the filter paper afterwards, the water was unclean, otherwise it was fresh.

Note:
We must note that fresh water is not always potable water, or water that can be consumed. Without treatment, much of the world's fresh water (including surface and groundwater) is unfit for human consumption. Fresh water may readily become contaminated as a result of human activity or natural processes such as erosion. On the other hand, there are various measures through which dirty water can be made fresh.