Grant Johnson wrote:
-----Original Message-----
From: Grant Johnson [mailto:[EMAIL PROTECTED]
Sent: Wednesday, February 21, 2007 6:27 AM
To: [EMAIL PROTECTED]
Subject: Re: (Aus Soaring) Hydration/Electrolytes
Chris - as you say, rainwater is very low in electrolytes - it gets very
little opportunity to dissolve electrolytes from dirt particles and other
sources in the atmosphere or from the substrate it is collected from. The
electrical conductivity (Ec) of the water is a measure of the dissolved
salts or electrolytes. Rainwater would typically show an Ec below 30uS/cm
which equates approximately with 15 parts per million (ppm) total dissolved
salts (TDS). Townwater supplies are typically 100-300 uS/cm equating to
50-150 ppm TDS.
It's worth noting that /*pure */water is not electrically conductive.
It's the impurities (the ions) that carry the current.
--
Robert Hart [EMAIL PROTECTED]
+61 (0)438 385 533 http://www.hart.wattle.id.au
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