experimenty s dusíkem
[youtube:http://www.youtube.com/watch?v=geWdq77lQ1Y]
[youtube:http://www.youtube.com/watch?v=WKziusscctc]
[youtube:http://www.youtube.com/watch?v=geWdq77lQ1Y]
[youtube:http://www.youtube.com/watch?v=WKziusscctc]