Specifically the ones that measure your temperature as opposed to the weather ones. I know about the mercury but is that in the ones you use for your temperature? And how to the touchless ones work?
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Mercury isn’t used in thermometers anymore, it’s usually alcohol now.
Basically, the bulb, the part that goes in your mouth (or anus for rectal thermometers) has most of the alcohol in it. That then expands and pushes the alcohol up, and it’s calibrated in such a way that the alcohol reaches a designated spot for each degree of warming. This is also how mercury thermometers work.
Touchless thermometers work by using a little infrared camera. By measuring the amount of infrared radiation coming off of you, it can gauge your temperature. This camera doesn’t have enough receptors to take an image of anything, just enough to measure the amount of light coming in. Think of it like a camera with just one big pixel
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