Which has higher air pressure when boiling water, lid or no lid?

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Which has higher air pressure when boiling water, lid or no lid?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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This question is not very well phrased. 'Atmospheric' pressure is normally taken to mean the ambient pressure surrounding the 'experiment'. It is clear that this does not change when the lid is put on. HOWEVER - what I THINK the question means is whether the pressure above the boiling fluid changes. If you think about it - the steam has to 'lift the lid' to escape - so the pressure must increase over when there is no lid. You know the temperature that water boils in atmospheric pressure - but you cannot answer the second part unless you know the ACTUAL pressure inside the pot with the lid on
has anyone ever made a decent cup of tea on the summit of Mount Everest? if not, why not?
you can make a statement about the RELATIVE value of the temperature - but unless you know the actual pressure you cannot put a number "degrees" on the change of temperature

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@MrNood so without the lid on the air pressure is greater? This question is about how boiling process is a cooling process. |dw:1443825835399:dw|
no - imagine if the lid was fixed (like a pressure cooker) as you heat the liquid - what happens to the pressure. NOW - the lid is a 'very heavy lid' it takes a force to lift it up - so when the lid is raised - it is the pressure of the steam that is lifting it
|dw:1443826100265:dw|

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