I left the spoon in the water after showing the cup from the tea that I was drinking last night makes a spoon like the pattern of bubbles

this is what it look like


  • 5
    $\begingroup$ Maybe it is just the gases naturally contained in the tap water, or maybe the spoon reacts with water. The former option seems more likely, but we need more experiments. $\endgroup$ Feb 12 at 7:51
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    $\begingroup$ If the tap water is relatively rich in gaseous $\ce{CO2}$ at the source, which is easier at low temperature, this gas will slowly get out of the water when stored in a warmer place where the air contains few $\ce{CO2}$. The spoon may here serve as catalyzer of this reaction. $\endgroup$
    – Maurice
    Feb 12 at 9:39
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    $\begingroup$ I agree with @Ivanneretin it looks like escaping of dissolved gases, as they have lower solubility in warmed up water. The spoon acts as a condensation center for gas bubbles and temporal heat conductor during water warming up. The spoon edges are the most exposed to the water, so the most effective in both ways. $\endgroup$
    – Poutnik
    Feb 12 at 9:59
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    $\begingroup$ What you're asking isn't just why do you get bubbles, but why do the bubbles form a pattern at the surface that corresponds to the outline of a spoon. I'm guessing what's happening is the spoon-like pattern on the surface is caused because bubbles selectively form at the edges of the spoon. Then, when they rise straight up to the surface, you get a pattern that replicates the edge of the spoon. This naturally leads to the question: Why do the bubbles selectively form at the edges or, to put it another way, why do they selectively form on extremely high-curvature surfaces? $\endgroup$
    – theorist
    Feb 12 at 10:00