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Humans will bond emotionally to just about anything that seems to have a face—or even just eyes. But it’s the ears on this device that really make it endearing. In the normal range of human hearing, the sound of a gas leak is hard to pick out from the background, especially in busy settings such as chemical plants and pipeline terminals. The ultrasonic range is comparatively quiet in most factories—except when high-pressure gas has sprung a leak. This gas leak detection unit from the equipment maker Emerson listens for telltale tones between 25 and 100 kHz, sounds that are inaudible to humans but can indicate a leak in gas lines.
Submitted by Craig Bettenhausen/C&EN
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