old thermometers

How Do We Measure Past Temperatures?

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How Do We Measure Past Temperatures? One way to measure past temperatures is to study ice cores. Whenever snow falls, small bubbles filled with atmospheric gases get trapped within it. In some places, so much snow falls that the older layers become buried and compressed into ice, locking away air bubbles in ice sheets and

Are Fish Tank Thermometers Still Made With Mercury?

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Are Fish Tank Thermometers Still Made With Mercury? Conclusion. Most aquarium thermometers are harmless to humans and animals. Long before the ban on the use of mercury came into force, many thermometers were already provided with a different content. The chance that you still have a mercury thermometer is not very big. Are mercury thermometers