羽根のない扇風機「ダイソン・エアマルチプライアー(Dyson Air Multiplier)」の風に乗って風船が扇風機をくぐり抜けていく気持ちいい動画をご紹介。 [YouTube] Balloons and Dyson Air Multiplier™ fans One balloon and a couple of evenings after work — Dyson engineers show how inducement and entrainment works on the Air Multiplier™ fan. If you watch closely, the balloon is sucked into the airflow from behind and to the side of the fan; this is inducement and entrainme