Why does the Black Sea sometimes glow at night? Detailed answer

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Why does the Black Sea sometimes glow at night? Detailed answer

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Why does the Black Sea sometimes glow at night?

For a long time, the glow of the sea at night was one of the most mysterious marine secrets for scientists. It turned out that it is caused by the luminescent properties of some marine organisms. In the Black Sea, for example, sometimes luminous in autumn, such an organism is an alga called nightweed.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Who and how first showed that air has weight?

The first to do this was the great Italian physicist, mechanic and astronomer Galileo Galilei (1564-1642), and in two ways.

In the first, qualitative experiment, Galileo, having achieved by thermal rarefaction of air in a flask with a long neck, carefully closed with a cork, made sure that if this vessel was allowed to float in water, then it would sink less than if the air was not rarefied.

In other quantitative experiments, Galileo used a pump to pump excess air into a flask, in addition to that normally contained in it, and measure the increase in the weight of the flask. Using ingenious tricks, Galileo measured the volume of air pumped into the flask, and based on this result determined the ratio of the specific gravity of air to the specific gravity of water. He got a value of 1:400. If we compare this value with the true one (1:773) and take into account what means Galileo then had at his disposal, then the accuracy of his measurements seems remarkable.

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Random news from the Archive

New LED drivers from Maxim 13.03.2008

Maxim Integrated Products has released two MAX3 and MAX16824 16825-channel LED drivers operating in the input voltage range from 6,5V to 28V. 36 mA of current for each ultra-bright LED. The DC current at each output is set using an external current-setting resistor of the output current-sensing resistor.

The MAX16824 features three PWM inputs that control the duty cycle of the output current, allowing a wide range of brightness. The PWM outputs can also control the on/off for each respective output. The MAX16825 offers a four-wire, 2 Mbps serial interface, a 3-bit shift register, and a 3-bit controlled register.

The serial interface allows the microcontroller to configure output channels using 4 inputs (DIN, CLK, LE, active-low OE) and a digital output (DOUT). DOUT allows drivers to be cascaded in series so that they can work together. The MAX16824 and MAX16825 passive built-in elements reduce the number of external components required, while maintaining +5% current accuracy.

Additional features include a 5V (+5%) regulated output with output current carrying capacity. The MAX16824 and MAX16825 are available in thermally enhanced 16-pin TSSOP-EP packages and have an operating temperature range of -40 to 85°C.

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