this is the science nearby project, my name is ekaterina beretskaya, hello, today we’ll find out togethercame to help people in the fight against the fire element, and what role science played in this, so don’t miss it in the program. barrel, box and grenade, let's study the history of the creation of the world's first fire extinguisher. what are they, fire extinguishers? modern ones, how many there are and how they differ from each other, are ready to fight fire, the correspondent of our program extinguished a real fire with the help of a fire extinguisher and now knows exactly how to do it correctly. the very first fire extinguisher in the world was a wooden barrel; it was proposed by the german zechariah gray to use it in the fight against the fire element. somewhere at the beginning of the 15th century. the barrel was filled with 20 liters of water and equipped with a small amount of gunpowder . if a fire started, the barrel was set on fire and rolled into the flames, it exploded and put out the fire. i’ll tell you right now how the first even remotely similar modern fire extinguisher

this is a science project nearby, my name is ekaterina beretskaya.will find out together when to help people. in the fight against the fire element , a fire extinguisher came in and what role science played in this, so don’t miss it in the program. barrel, box and grenade, let's study the history of the creation of the world's first fire extinguisher. what kind of modern fire extinguishers are they, how many are there and how do they differ from each other. and ready to fight the fire, the correspondent for the program extinguished a real fire with the help of a fire extinguisher and now knows exactly how to do it correctly. the german zechariah greil suggested using it in the fight against the fire element somewhere at the beginning of the 15th century. the barrel was filled with 20 liters of water and equipped with a small amount of gunpowder. if a fire started, the barrel was set on fire and rolled out into flame, it exploded and put out the fire. how did the first one appear? at least vaguely similar to a modern fire extinguisher, i’ll tell you r

this is a science project nearby, my name is ekaterina beretskaya, hello, look at the program.from the usa and a chemist from switzerland, who invented the first sunscreen? the question is not aesthetics, but health, why the skin from solar radiation needs to be protected not only by ladies, but also by representatives of the stronger half of humanity. and protection in a tube, how products with spf work, a great conversation in the studio of the program with a dermatologist. the first who thought about sun protection were the ancient greeks; they rubbed their skin with olive oil, but as you understand, this did not solve the problem. the ancient egyptians, in an attempt to avoid sunburn, used extracts of rice and jasmine. but only after thousands of years in in the forties of the last century, it was possible to derive the formula for the first sunscreen. i’ll tell you how it happened right now in our history section. well, let's start with deciphering the abbreviation spf, translated from english as sun protection factor. the first synthetic product with this same sun protect

my name is ekaterina beretskaya. hello, look at the program.icine have to do with the topic of water purification, we will tell you in our section history of the issue. transparent does not mean safe. let's work with experts to figure out how the quality of the water that flows from our taps is controlled. determination of the integral indicator dry residue, which. shows the total salt content of water, also an integral indicator that shows total pollution, a big conversation in the program studio about the latest developments of our scientists in the field of water purification. people began to purify water in ancient times, but at least they made such attempts with the help of, as we would now say, filters. natural, i will tell you how it was in our traditional section history of the issue. one of the very first simplest ways to purify water was boiling; people essentially began boiling water as soon as they learned how to make fire. next were pine needles, sand and tree bark. the invention of the first design specifically designed for water