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this post was submitted on 22 Sep 2023
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I'm honestly surprised this doesn't happen more often than it does, considering how much coffee McD's sells.
They're supposed to serve it at a safe temperature, and they usually do.
tbh I'm not sure how they managed to overclock their coffee maker. Did they just heat it up on the stove?
Yep, wife used to work for Starbucks. You're supposed to check/calibrate the thermostat on the machine on a regular basis so you get the coffee hot but not boiling, third degree burns hot. For whatever reason, it has to be done because the thermostats will gradually deviate from their initial settings. If you fail to check your thermostats, eventually someone's going to burn the fuck out of themselves with a hot drink. Water, which is the main ingredient in any coffee product, has an enormous heat capacity, and will absolutely fuck your shit up before you have a chance to do anything about it.
IIRC, McDonald's was either deliberately tampering with their thermostats or just failing to check them when that famous case went down, which was how they were found to be negligent.
They determined that the average customer stayed in a given McDonald's after ordering for x minutes, so they made the coffee so hot it couldn't be consumed within x minutes in an attempt to get people not to utilize their free refills on coffee. The coffee was so hot it was dangerous. All to save a customer from getting 2 more cents worth of coffee.
Shareholders don't ruin someone's life in exchange for an extra 0.0001% return this quarter challenge (impossible)
I thought it was so the coffee would still be hot by the time you got to wherever you were driving to. Your explanation makes a lot more sense though.
It makes a lot more sense if you presume malice. I put incompetence up top, followed by another explanation on this thread that the idea was to keep your coffee hot until you get to your destination.
I don't think I understand how it can be hotter than 100 celcius.
I'm not defending McDonald's here, they can rot.
Like, coffee is mostly water, and water boils at atmospheric pressure at 100c. Milk boils slightly more than 100. I guess the lid would pressurise the steam a little? Maybe the coffee grinds hold the heat far more than the water? I wouldn't have thought it would be diluted too much to make a difference.
I guess this is a stupid question, because it happened. But how can boiling water cause third degree burns in the quantity of 500ml? I thought it'd have to be much more than that and very prolonged?
Half a liter of boiling water will absolutely do damage, especially if you're restrained to a seat and can't get away from it. The water that comes out of your tap at home is probably only in the 140s, max, and that'll do some damage.
I'm also not certain anyone said the water was greater than 100c. I think the seminal case involved water that was 180-190 degrees F or something, and that it's standard to be closer to 150 or so, which is essentially as hot as your tap gets at home.
OK cool.
It was me that said it can't go above boiling, 100. I was just under the impression that it would burn of course, but third degree burns was surprising to me. Burning away the epidermis and nerves of the skin entirely seemed to me to require a much higher temperature. I guess I'm wrong, probably because of clothing holding the heat around the skin.
Thanks.
It's prolonged because the spill happened on clothing, so the boiling water is held on to the skin instead of just running off.
That makes sense. Thanks.
I know your question about the burns is already answered by others but its important to consider that the generally accepted optimal temp for extracting the flavour from coffee beans is approx. 90-95°C, and hotter gives the coffee a more 'burnt' or less favourable flavour, so your coffee shouldnt be that hot. Further to this if you drink your coffee with milk, the milk is frothed at about 65°C which would bring the overall temp down a little more.
This is all in an ideal world where Maccas actually gives a fuck if their coffee is 'good'