| 摘要 |
PROBLEM TO BE SOLVED: To allow easy demonstration for air flow by an exhaust or ventilation device with no discomfort of an observer, with a simple configuration at low cost. SOLUTION: A frame 13 and a soap bubble generating device 14 provided on the upper surface side of the frame 13 constitute a demonstration tool 10. The soap bubble generating device 14 comprises a blower 19, a plurality of ring members 20 positioned between a blow-out opening 19A of the blower 19 and a range food 11, support part 21 which supports the ring members 20 for rotation, and liquid bath 23 for a soap bubble generation liquid C. When an operation handle 30 is rotated, the ring members 20 rotate and plunge sequentially into the soap bubble generation liquid C of the liquid bath 23, and the blower 19 generates a wind which hits the ring members 20 to which the soap bubble generation liquid C sticks, sequentially generating soap bubbles B. The soap bubbles B move along an air channel L of the range food 11. |
