The wet CO2 gas pressure is less than atmospheric pressure because a higher water level means a lower atmospheric pressure.
Because a lower atmospheric pressure results from a higher water level, the wet CO2 gas pressure is lower than the atmospheric pressure. Therefore, the wet CO2 gas pressure is lower than the atmospheric pressure outside the cylinder if the water level in the CO2(g)-collection cylinder is higher than the water level outside the cylinder.
Water moves because of the force that high air pressure has on its surroundings. So, a sea area with high air pressure will have low sea level, and vice versa, a sea location with low air pressure (a depression) will have higher sea level. The inverse barometer effect is what is known as this.
Therefore, the wet CO2 gas pressure is less than atmospheric pressure because a higher water level means a lower atmospheric pressure.
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