The speaker discusses their attempt to preserve a watermelon for the New Year using liquid nitrogen. They initially tried to use a dewar vessel, but it was too small for the watermelon. They then purchased a thermos with excellent thermal insulation properties and discovered that it was able to keep water hot for 23 hours. The speaker also bought a special freezer that can keep items frozen for a long time without being plugged in. They used dry ice to freeze various fruits, including a watermelon, and observed how they would behave when thawed. To freeze the watermelon, they built a custom container around it and had a welder seal it hermetically. The speaker then filled the container with liquid nitrogen and is waiting to see how the watermelon will turn out by the New Year. They also tried three different methods to preserve the watermelon, including using a simple freezer at -18 degrees, and are curious to see which method will be most effective.
Here are the key facts extracted from the text:
1. The narrator attempted to preserve 10 watermelons using various methods, but all of them failed and the watermelons rotted.
2. The narrator has a method that they believe will work 100% to preserve a watermelon for the New Year.
3. The narrator has a dewar vessel with a capacity of 135 liters of liquid nitrogen.
4. The dewar vessel has a special hook with a cup for storing biological materials.
5. The narrator found a thermos on the Yandex market that can keep water hot for 23 hours.
6. The thermos has a double-walled vacuum insulation that keeps the heat from escaping.
7. The narrator bought a special freezer that can keep items frozen for a long time without being plugged in.
8. The freezer has excellent thermal insulation properties, keeping ice frozen for two weeks.
9. The narrator is using dry ice to freeze various fruits, including a watermelon, pear, grapes, lemon, and berries.
10. The narrator is using a container with a vacuum insulation to freeze the fruits.
11. The temperature of liquid nitrogen is -195 degrees Celsius.
12. The narrator is using a welder to create a custom container to freeze the watermelon in liquid nitrogen.
13. The welder is using argon gas to prevent combustion during the welding process.
14. The narrator has a vacuum pump to pump out the air from the container.
15. The narrator has 100 liters of nitrogen left and is using it to fill the container.
16. The narrator installed a dehumidifier to maintain a consistent humidity level.
17. The narrator is testing three different methods to preserve watermelons: freezing in liquid nitrogen, using a simple freezer at -18 degrees Celsius, and using a dewar vessel with liquid nitrogen.