How does oil pollute drinking water? Detailed answer

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How does oil pollute drinking water? Detailed answer

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How does oil pollute drinking water?

Just 1 drop of oil makes 25 liters of water unfit for drinking.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why are stingrays stingrays?

Stingrays are cartilaginous fish. They have a flat body with wide fin-wings on the sides. They also have a long thin tail. Some stingrays have a venomous spike on their tails, and they are called stingrays. Stingrays never use this spike for offense, only for defense. But that doesn't make them any less dangerous.

Stingrays have many interesting features. For example, their mouth is on the underside of their body and they never see what they are eating. Female stingrays carry their eggs inside their body and give birth to small stingrays - this is called ovoviviparity.

The top of the body of the stingrays is dark, and the bottom is light. Guess why. To do this, imagine that you are looking at a stingray from under the water, from the bottom, and you see it against the background of a light sky, and then from above, and then it is already visible against the background of a dark bottom.

Test your knowledge! Did you know...

▪ How do plants eat?

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Random news from the Archive

solar cell excitons 03.03.2008

A Dutch graduate student has managed to improve the properties of a polymer solar cell.

One type of polymer solar cell is a dye layer that is deposited on a semiconductor layer. Usually in its role is the basis of white paint - titanium dioxide. Both substances are inexpensive, and it is believed that such batteries can get solar power off the ground. And it is marking time, since the production of silicon batteries is very expensive, and silicon itself, the raw material for them, is not that much in abundance.

A battery of dye and semiconductor works like this. A photon of sunlight falls on the first layer, is absorbed and excites the so-called exciton - a quasi-particle, which is an excitation of the electronic system. This exciton moves into the semiconductor and causes the formation of free charges in it, that is, it forms an elementary electric current. The trouble is that the path traveled by an exciton is extremely short and most of them are lost before reaching the semiconductor.

"I managed to choose such a dye that the exciton path increased twenty times, up to 20 nm. Approximately the same amount of time an exciton must travel in a plant leaf before it turns into chemical energy. In the case of a solar battery, this path must be increased three times more, and then its effectiveness will no longer be measured in percentages,” says Annemarie Heiser, a PhD student at the Delft University of Technology.

Recall that now the coefficient of conversion of light into electricity for polymer batteries is 4%, and the record for silicon is 40%.

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