Christmas Brownies

In preparation for christmas dinner, Calvin was cooking macaroni and cheese in a metal pot over an electric stove set on low heat. Once it's done, he set it aside directly on the granite countertop, but forget to turn off the stove (as he's busy cooking). He then took out the brownies from the oven, which were baking in a glass tray, and set them on top of the stove (due to a lack of space).

What happened to the tray of brownies?

The tray of brownies exploded The tray of brownies were happily consumed The tray of brownies were kept warm The tray of brownies became burnt

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2 solutions

Eddy Li
Dec 31, 2015

This is the exact solution: [to both Calvin and Aditya]

The first two options are very, very wrong as the "electric inductive stove" cannot transfer the heat to the brownies since the medium of the tray is glass {glass is not very electro-conductive}, so you will never see the brownies being burnt.

However, the main reason the glass tray exploded in this scenario is because the glass is an "amorphous solid" (can't find a proper term). Therefore, the glass molecules are "jiggling" as it is cooking in the oven, making the structure unstable. When it is placed on a metal or a glass cook top, the heat must be dissipated, but since the glass in the oven tray is also not heat conductive, it dissipates the heat very rapidly from the air that it soon becomes extremely brittle and breaks due to the 'thermal stress' [cudos to Berkal Tiliksew]. This is why we need a towel to dissipate the heat so it cools down at a lower rate.

Now Calvin is definitely lamenting on the fact glass shards are in your favourite brownies.

Great explanation! Yes, indeed.

After the glass shattered, the small pieces fell through the electric grill and the brownies touched the grill and so they caught fire.

Calvin Lin Staff - 5 years, 5 months ago

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Oh god. Hope the rest of your. Christmas wasn't so "explosive"

Trevor Arashiro - 5 years, 5 months ago

You should probably specify its inductive rather than just electric

alex allen - 5 years, 5 months ago

That turns out to be true! Never thought about it. Great!

Aditya Kumar - 5 years, 5 months ago
Calvin Lin Staff
Dec 30, 2015

The glass tray exploded leaving glass shards all over the kitchen. The brownies caught on fire and my entire house was smoked out with the smoke alarms ringing (and I disconnected the batteries)

Do you know the exact reason? I'm curious how that happened.

Aditya Kumar - 5 years, 5 months ago

Happy new year @Calvin Lin ... did this happen about three hours ago ? ( today morning as I stay in India )

Anirban Mandal - 5 years, 5 months ago

Poor brownies :(

Nihar Mahajan - 5 years, 5 months ago

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I know, right?

Eddy Li - 5 years, 5 months ago

I prefer chocolate chip cookies❤ rather than brownies

SAMURAI POOP - 5 years, 5 months ago

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