Re: pinhole Boiling of water

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From: pauld@exploratorium.edu
Date: Thu Nov 06 2003 - 21:41:21 PST 

Message-ID: <1288.209.239.173.234.1068183681.squirrel@www.exo.net>
Date: Thu, 6 Nov 2003 21:41:21 -0800 (PST)
Subject: Re: pinhole Boiling of water
From: pauld@exploratorium.edu

Hi Jay

You can boil water in a dosage syringe (one designed to deliver medicine
to children that does not accept a needle.)

Here is the write-up

http://www.exo.net/~pauld/activities/boylingwater.html

Water will boil at 0°C at a pressure of 6 millibars ( one Bar is the
atmospheric pressure on earth.)

Most vacuum pumps will reduce the pressure enough so that room temperature
water will boil. But be sure to run the vacuum pump for a few hours after
doing this experiment to drive the water vapor out of the vacuum oil.

Paul D

> Hello,
>
> Does anyone know if there is a way to simulate a low
> pressure environment, so that one could show the
> lowered boiling point of water?
>
> Also, does one need to achieve zero atmosphere to make
> water boil without raising its temperature?
>
> Thank you very much.
>
>
>
>
>
>
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