A Brief History of Gas Detection
| Before technological advances allowed scientists to develop gas detection equipment, people had to rely on other warning methods. | |
Using your feelings | |
| Most gases are colorless and invisible to humans. However, smell and sound can help alert people to a gas leak. Some gases have an odor and some have an additional odor so they attract attention when they leak. You can also sometimes hear a faint hiss from a leaky gas pipe. |
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Canaries in mines | |
 | The canaries were taken to the coal mines as an early warning system for high gas levels. The canary showed signs of distress, stopped singing and eventually died. These signs will alert miners before the gas level becomes dangerous for them. |
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