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Name: Sara
Status: educator
Age: 30s
Location: N/A
Country: N/A
Date: 2000


Question:
My third grade class has been studying water and the properties of evaporation. We are wondering why during an experiement did vinegar evaporate faster than any other liquid we used?


Replies:
Hi Sara!

Look...first thing: if you are dealing with different liquids, the rate of evaporation (faster or slower) will depend upon the liquids you are using at the the experiment, the faster at one group, can be the slower at another one.

2) each liquid substance has a "specific heat of vaporization" that means the quantity of heat required to change exactly one gram of it into vapour at its boiling point.

3) vaporization occurs at the boiling point, but evaporation can occur at a much lower temperature. The rate of evaporation is affected by many factors as the room temperature, the surface of the liquid exposed, air currents and so on.

4) Vinegar is a commercial product , usually a dilute (4-5%) aqueous solution of acetic acid, so it is mostly water, if the other liquids you mention are organic as alcohol, ether, acetone, they will evaporate much faster than the vinegar itself.

Experiments must be based into observation of facts, that are reproduced upon the same circonstances or situations.

I'd recommend that you repeat the experiment and ask again telling us exactly all the facts. And

Thanks for asking NEWTON!

Mabel
(Dr. Mabel Rodrigues)



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