My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on.ksquires1988 t1_iy9ogky wrote
Reply to comment by Prindagelf in My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on. by Iain_MS
IIRC that metal spring is actually 2 metals. I think it's called a bi-metallic strip.
WFPBvegan2 t1_iy9pmy3 wrote
This is correct.
voodoohotdog t1_iyaywpb wrote
These are the correct answers. Thank you great Sages.
WFPBvegan2 t1_iyb0mif wrote
At your service my friend.
LazerWolfe53 t1_iyckgom wrote
This guy is also correct
darrellbear t1_iybvsvj wrote
It's called a mercury switch, used to be pretty common.
Significant-Funny-14 t1_iybltvo wrote
That is correct. I believe one piece of metal expands more with heat than the other, causing a flex rather than just extending very slightly
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