| 摘要 |
PURPOSE:To easily and securely detect a position and a path where the air in an automobile room is sucked out of the room by finding a pressure difference generated between the inside and outside of the room during the traveling of the automobile. CONSTITUTION:If the air in the automobile room A is sucked out to the outside B from some position between a door opening part 1a and a door 2 when a wind which is considered to be generated at the time of traveling is sent from the front of the automobile body 1 to the rear, gaseous iodine in a room A is sucked out to the outside B together with the air. At this time, the gaseous iodine operates on starch paste 7 and 7 applied to the peripheral edge of an opening part 1a to cause iodine-starch reaction, and the starch paste 7 and 7 at the air suction part color in blue. For the purpose, the discoloring part of the starch paste 7 and 7 is checked to easily and securely detect the outward suction part of the air in the automobile room due to the unsealing of the seal part between the opening part 1a and door 2 during traveling.
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