RE : mercury substitute

[Jon Pike <jhpike@domain.elided>]

> lets not forget that mercury has the
> highest surface tension of any liquid.
> that keeps it from sticking to the inside
> of the tubes and allows it to be readable
> as a real-time gauge. 
True..  as well as it is extremely heavy,  a piece of lead will FLOAT in 
it..

The gauge wouldn't read the same,  possibly not even read on scale at 
all.. if you used some lighter kind of liquid.

Add to that the toxic nature of mercury.. (it has a significant vapor 
pressure at room temperature) and I'd skip trying to refill it,  I 
believe there are similar gauges (spring type?) available for $25 or so.

Probably your easiest solution.

Jon
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