Discrepant Event "The Second Boil"

[jkingiv]

Haha. It's the Leidenfrost effect!

The metal is so hot that the boiling liquid is kept off of it, slowly boiling because the liquid has created a vapor barrier that insulates it. When the metal cools enough, the vapor barrier goes away and the bulk of the liquid can hit it. This is the second boiling. It only works if the metal is super hot! You can google the Leidenfrost effect.

Aweome Demo by the way.

[RandyWho92]

This makes me think about Briggs-Rauscher's reaction. Not quite as constant and oscillated but I am probably 100% wrong on this but what can a guess hurt? I think the first reaction occurs from heat and chemistry but the second comes from the cooling of the product and then the coppery color isn

t even copper right? Just a fluke but a good one. Get back to me if I am even close otherwise get back anyways so I can ask questions that can spark good universal science questions :]

[maitrevoodoo]

Pretty nice chemistry classes I bet if you show those experiments to your students!

I like what you do

[Wrydryn]

I'm going to guess that the quarter in oxidizing after boiling the first time, then it changes colors.

[isibane777]

I think it's because the bubbles from the bottom get trapped under the quarter and then after a few seconds finally have enough to break the tension. That's neat!

[milotickz]

Your experiments are SO COOL!!