How do we find vapour pressures, and boiling points of various substances?

Answer 1

How else but by experiment?

Thus, you gather your test tubes, beakers, and pots and pans, put on your safety gear, submerge a thermometer in the liquid, and turn up the heat.

Note that the vapour pressures of many common liquids, water, ethanol, mercury, are extensively tabulated at various temperatures. Of course, at their normal boiling points, whatever these are, their vapour pressures are #1*atm#. With me?

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Answer 2

Xavier Avery

Vapor pressures and boiling points of substances can be determined experimentally using techniques such as the Knudsen effusion method, the static method, or dynamic methods like the ebulliometer.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.