Paleobarometers
We consider atmospheric pressure as a constant value, but has it always been so? One way to analyze how atmospheric pressure has changed throughout Earth's history is to analyze the gas bubbles trapped by lava in the solidification process. Another way is to study the structure of primitive insects such as brushes. The anatomy of these paleobarometers depends on the environmental pressure, that is, the size of the thorax of insects and wings depends on the density of the air, since otherwise they could not perform their coating dance. Thanks to this characteristic, the fossils of these insects help us to know what was the atmospheric pressure of past times and, according to the researchers, this pressure has not changed too much in the last 250 million years.
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