Just throwing this out.... if you ever need to know the rough level of a
tank of some kind of liquid - emphasis on "rough" level - pour hot
water on the side and then feel the surface. Above the level of the
liquid the metal will stay warm while the metal contacting liquid will
Once in a while you run across a simple trick that does the job. I
wonder what other simple ways there are for things like this in a pinch?
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