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I've come up with a riddle that I use on a daily basis to solve a simple problem.

In a kitchen, you have a water tap that can run cold and hot water (or a mixture). The more fancy ones have a handle that can rotate in 360 degrees where horizontal movement determines the temperature, and the vertical movement determines the tap being on or off.

It is possible to determine how warm the water is without touching the water itself or using any device that measures the temperature that will work on most, if not all water taps (I have not found a tap where this did not work)

So, how can you determine if the water is cold, warm or hot without touching the water?

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    $\begingroup$ Why was this question down-voted? Seems to follow the guidelines of the help center. $\endgroup$ – LPChip Apr 28 '20 at 10:50
  • $\begingroup$ "Water crane"? Do you mean a tap - I doubt you are filling steam-powered locomotives... $\endgroup$ – Chronocidal Apr 28 '20 at 11:00
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    $\begingroup$ @LPChip I'd guess you're Dutch. The Dutch word for tap/faucet is "kraan", and the same word is also used for the bird and for the lifting device. $\endgroup$ – Jaap Scherphuis Apr 28 '20 at 11:21
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    $\begingroup$ @JaapScherphuis I am indeed. :) $\endgroup$ – LPChip Apr 28 '20 at 11:24
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    $\begingroup$ @Chronocidal It's a nice descriptive word though :-) I understood immediately what it must mean. $\endgroup$ – Rand al'Thor Apr 28 '20 at 11:26
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You can just try it with your hand.

This part is in direct contact with the water, and it's made of metal (decent at conducting heat), so it will be the same temperature as the water:

enter image description here

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  • $\begingroup$ Yes, that is the correct answer. :) And it even works before you open the crane. $\endgroup$ – LPChip Apr 28 '20 at 10:42
  • $\begingroup$ @LPChip Yes and no. if you need hot water now, but you haven't used the tap in a while, the water in the handle is obviously cold $\endgroup$ – DudeWhoWantsToLearn Apr 28 '20 at 13:36
  • $\begingroup$ @DudeWhoWantsToLearn I'm not asking how to get instant hot water, only how to find out what the current temperature is. As the metal cools down, so does the water. $\endgroup$ – LPChip Apr 28 '20 at 13:49

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