<p dir="ltr">Random ideas: </p>
<p dir="ltr">Weigh the jar as you put the argon in. My quick wikipedia-ing suggests the difference in densities is half-a-gram per liter at STP, so you'll need an accurate scale or a large volume jar to get an accurate measure.</p>
<p dir="ltr">How about a balloon that starts empty. Put the equipment in the balloon, suck the air out, fill with argon.</p>
<p dir="ltr">Just how 'oxygen free' is required? Store immersed in oil like lithium/sodium samples? Convert all oxygen to ozone? Store under a stream of argon if only needed for short periods?</p>
<p dir="ltr">G</p>
<div class="gmail_quote">On 7 Jun 2020 8:33 PM, "Mark Atherton" <<a href="mailto:markaren1@xtra.co.nz">markaren1@xtra.co.nz</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I need to store a thermionic emitter in a jar which is free of oxygen, and just discovered that argon may an acceptable gas.<br>
<br>
Argon is heavier than air, so it may be as simple as filling a small vertical container with Ar, and placing the emitter at the bottom.<br>
<br>
I do need some simple instrumentation to tell me how full the container is, so can either be an argon or an oxygen detector.<br>
<br>
Just wondering if anyone has experience using a car oxygen sensor in the wild, or if there are any other readily available techniques which should be considered (lighted taper would work, but messy).<br>
<br>
Thoughts please.<br>
<br>
Mark<br>
<br>
<br>
<br>
<br>
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