Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). 1/8th speed (15fps) and improved video performance because somehow Youtube cropped the last frames of the other videos (?) I didn't quite understood the need for a razor blade but without one I still see the flow of air. For me, the razor blade just makes the dot of light smaller(?) If anyone can clarify me what the razor blade really does and where it should be placed (in the source of light or in the camera) I'd really appreciate. Also important to note that this is AWESOME to look with the naked eye but almost the dimmest light can blind you. I covered a tiny LED torch with aluminum foil and punctured a hole with a sewing needle, on the side! so that the LED doesn't bright directly through the hole. Take care with the eyes!!

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Live a board / Riverboat - Både sælges, Dyreborg 33, 1966 DKK 780.000 Scanboat https://www.scanboat.com/en/boat-market/boats/live-a-board--riverboat-dyreborg-33-17518446

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Die gesamte Theorie, Tipps und Gerätetraining in unserem SRC Onlinekurs. Erhältlich ca. im Frühjahr 2021 auf https://segelnag.com Seefunktexte für die SRC- und LRC-Prüfungen zum Übersetzen und fürs Diktat. Eigennamen werden hierbei wiederholt und buchstabiert, Zahlen werden wiederholt und in einzelnen Ziffern durchgegeben. Englischer Text: Red rockets observed in position 55-16N 016-23E, true bearing of 45 degrees, all ships in this area please keep sharp lookout and report to MRCC Gothenburg. Deutscher Text: Rote Raketen beobachtet auf Position 55-16N 016-23E, rechtweisende Peilung 45 Grad, alle Schiffe in diesem Gebiet bitte scharf Ausschau halten und an MRCC Göteborg berichten. Onlinekurse und Bücher zu FKN, SBF, SKS, SSS, SHS, Funk auf: https://segelnag.com Unsere beliebten Videos: Überblick Segelscheine: https://www.youtube.com/watch?v=g1ixPABqpdA Onlinekurs SBF See: https://www.youtube.com/watch?v=_Ao2z_TkADw Onlinekurs FKN: https://www.youtube.com/watch?v=8PcNoM6Uxg4 Onlinekurs SSS & SHS: https://www.youtube.com/watch?v=9-I7uTaZTy4 Unser Equipment (Affiliate Links): https://kit.co/segelnAG/gear-for-youtube Lernunterlagen für: SBF See & Binnen: https://kit.co/segelnAG/sbf-see-binnen-lernunterlagen SKS: https://kit.co/segelnAG/sks-lernunterlagen SSS: https://kit.co/segelnAG/sss-lernunterlagen SHS: https://kit.co/segelnAG/shs-lernunterlagen SRC: https://kit.co/segelnAG/src-lernunterlagen LRC: https://kit.co/segelnAG/lrc-lernunterlagen UBI: https://kit.co/segelnAG/ubi-lernunterlagen

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March 14th...giornata della matematica, Pi Greco day. Perchè non utilizzare le cifre di π per costruire una spirale, la spirale di Archimede, da appendere in classe o nel corridoio? Se appesa sopra un termosifone o un'altra fonte di calore, diventa una divertente attività ed esperimento con cui scoprire alcune caratteristiche dell'aria: la spirale ruota e si muove perchè spostata dall'aria calda. L’aria calda è più leggera dell’aria fredda perché meno densa e sale verso l’alto. https://maestramonica.it/pi-greco-day-la-spirale-di-archimede-matematica/

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