caretaker

Just charged mine up, I call it a Mexican Lie Detector.

MikeUK

Go read your chemistry books

There are several exothermic reactions that can be used that don't involve 'flames' that can be used to heat your water

One type in particular has been usd by Nestle to create a self heating coffee can, and its also used quite a lot in japan for self heating Saki...

BristolUK

Who needs chemistry books when you have


Thanks for the info.

BristolUK

Bloody typical.

A dozen self heating cans of soup.

Amazon USA $35.88

Amazon Canada $62.03

Souvy

Did your chemistry teacher at school ever pull the anhydrous copper sulphate stunt on you?

Mine did.

Bastard.

MikeUK

My school teacher was borderline paranoid... I remember lots of blast screens if smoke might appear

Intrigued as to the stunt? hot blue water ????

MikeUK

They have to work twice as hard to get it warm ...... plus they have to work in C and not F ....

Oink

Demand and supply. Ice fishing.

Souvy

The copper sulphate you may be familiar - the blue crystals, are hydrous copper sulphate. If you heat them in a test tube (endothermic reaction, ie heat going in), the water is driven off. The result is a white powder.

A suitably mad chemistry teacher will then place a mound of the white powder in the palm of the hand of a suitably gullible pupil <waves> and then drip some water on it. That creates an exothermic (heat out) reaction and a fairly rapid and nasty one.

Imagine stubbing a ciggy out on the palm of you hand.

As I recall, the git also got me with nitric acid. That particular experiment was to see how long you could stand having nitric acid on your fingers before sticking your hand under a tap. Not long, is the answer.

I had some explaining to do when I got home, with what looked like serious nicotine stains on my fingers!

All this happened in the 70s, of course.

MikeUK

Shit That's nasty, and I was thinking maybe holding a beaker and the water getting hotter as he added the powder and it went blue... not directly on the skin... Ouch!!

I think you had a sadist not a teacher

granted pouring ether into toilet bowls and waiting for somebody to smoke /light up in the toilets was funny....



Thinks... there was another chemical that once on your fingers made you look like a 40 a day man... and something else made it go away almost as fast...

Souvy

Bicarb? Excellent for most stains. Mixed with olive oil, it is superb for getting grease and oil off your hands.

I think the teacher "retired". Possibly after the incident when he set up a still in a morning class and then fed a bunch of 16-year olds with neat ethanol. We didn't need to go out and smoke pot that lunchtime.