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Re: Gas Level Indicator

If gas is running, then there should be evaporation of the liquid,
which would cool it. I would assume it is a liquid crystal that,
like all liquid crystals, is temperature sensitive, and they've put
the set point near room temperature. I wonder how well it would work
in northern Michigan in the dead of winter.

Paul Zitzewitz

I picked up a little $3 thing the other day, flexible plastic about 8x6 cm
and a few mm thick (looks like a refrigerater magnet) which magnetically
sticks to a propane tank and indicates when the gas in the tank is low. A
vertical color bar changes color at the level of the gas. Says it only
works when the tank is on (for 2-5 minuites) and gas is going out. Anyone
have any idea how this is suppose to work? The only thing I can think of is
if the vapor in the tank cools faster than the liquid so there is a
temperature gradient at the liquid/gas interface and the plastic is
actually temperature sensitive....?

kyle

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
! kyle forinash 812-941-2390 !
! forinas@indiana.edu !
! Natural Science Division !
! Indiana University Southeast !
! New Albany, IN 47150 !
! http://Physics.ius.indiana.edu/Physics.html !
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



Paul Zitzewitz, Professor of Physics
Department of Natural Sciences
University of Michigan-Dearborn
4901 Evergreen Rd
Dearborn, MI 48128
(313) 593-5158 FAX (313) 593-4937