My name's Tamas Voros, I'm a physics and mathematics teacher working at the same high school for lots of years, in Budapest,Hungary. This is the school, where I work at: http://www.semmelweis-bp.sulinet.hu. Some words from me you can find here: http://trip2science.com.
In 2013 I got a chance to show the interesting features of the liquid nitrogen to my students. The liquid nitrogen - named LN2 - is a very cool fluid, its temperature's -196 Celsius. Because, it's so cool, we can store in a special tank, named Dewar flask (high tech thermos flask, in what the hot tea will be hot for weeks :) There is a flask, what I need:
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From the company, that produces the LN2, until 2014 anybody could rent such flask for the carriage, but last year, and the one before,not anymore. In 2015 I got a Dewar flask for lend from the ELTE Unversity - I upload parts of the experiments to Youtube in hungarian, and in english with the help of my little FullMoon. ( youtube.com/trip2science) -, but last year I couldn't stage the LN2 party for my students.
The LN2 isn't an expensive material, but the Dewar flask is very costly. I didn't get financial help until today,the day I started this crowdfounding. I hope, in this year I can stage the LN2 party for my students with thelp of the founders.
I asked a proposition from a websíte of a company, from that I can buy a good quality product. There's the result:
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That's, what I need help for.