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Born 1564, Devoloped the suction pump when he was 66 years old, in 1630. He used it to draw underground water to the surface.
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Born 1608, invented the barometer in 1643 when he was 35. He was the first to use mercury as a liquid in his experiments.
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Born 1602, developed the vacuum pump over the course of two years, 1643 to 1645. He was 41 years old during his creation time period.
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Born 1623, used the previously invented barometer to discover Atmospheric Pressure in 1648. He was 25 during these studies. The SI unit of pressure was named after him. The Pascal.
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Born 1629, developed the manometer in 1661 when he was 32 years old.
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Born 1766, created a hypothesis called "Partial Pressure" in 1801. The idea is that in a mixture of gases, the total pressure is equal to the sum of each induvidual gas. He was 35 years old at the time.
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Born 1778, proved the law of combining volumes in 1808 when he was 30 years old.
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Born 1776, created the "Avogadro's Hypothesis". The idea is that the pressure in a container is directly proportional to the number of particles in that same container. This was in 1811 when he was 24 years old.