How do vapour pressures of substances like dry ice, and water, and mercury, relate to boiling point?

1 Answer
anor277
Aug 29, 2017

Does a vapour pressure exist for dry ice?

Explanation:

I think it does, given that dry ice sublimes.........but under standard conditions it SUBLIMES, and DOES NOT exist in the liquid state.

And certainly a vapour pressure exists for water, and this, the so-called saturated vapour pressure is extensively tabulated. Mercury expresses a MUCH LOWER vapour pressure. Why should this be so?

As always, the boiling point of a substance is the temperature at which the vapour pressure is equal to the ambient pressure, and bubbles of vapour form directly in the liquid. The "normal boiling point" is specified when the ambient pressure, and thus also the vapour pressure of the BOILING LIQUID, is "1 atmosphere".

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