Turning gypsum into plaster

[@alext9067]

I don't remember school being this interestiing.

[@filipkartousek]

I dont remember school without female teachers.

[@Klaus-Schwab_Dictator]

@@filipkartousek Simp

[@jdcarter3626]

I mine my plaster right out of the river(when it's low) and grind it up and it works really good.

[@Maninawig]

I dunno if it's the same in Australia, but we have two other uses for gypsum: We compress the powder into 1.27cm thick sheets that are about 2.4384m by 1.2192m long. Due to the States, these measurements make more sense in the imperial system: 1/2" sheets that are 4' by 8' Anyways, the sheets are then wrapped and sealed in 2 layers of paper, brown on one side and usually white on the other (although green signifies moisture resistant sheets and blue is moisture and mold resistant) which we hang on our wood framed walls with a screw every 16" apart. For the sealing, the same method is applied with sheets that are 3/4" thick and have an extra screw. The second and older application is done to make a rougher paste than Plaster of Paris and is used to fill in cracks on the walls. This used to be used to cover walls completely, but was hard to keep flush.

[@waynej747]

Looking In With Victor B Commonly known as plasterboard here in Australia

[@Maninawig]

@@waynej747 here we call it drywall. But many countries don't know about it, so I didn't want to assume

[@andthen0170]

Yep, and here in Australia it is 1.2m x 2.4m x 13mm typically

[@gorillaau]

Plastedboard or the trademark name Gyprock which is made by Boral I think.

[@woodyofp8574]

I think the reason ornate wallpaper used to be so popular, was to cover up the inconsistent surface of lath and plaster walls.

[@spotoncam3640]

What I understood here is :- Raw gypsum block has trapped water molecules and when pulverized it can be sold as gypsum powder or gypsum board. When gysum powder is heated to 150 to 300 degrees celcius, the water molecules is evaporated and you get "plaster of paris" (a.k.a. PoP) . When PoP is mixed in water, then fhe mixture left for drying actually releases heat and that is actually turning PoP back to dry gysum with some moisture ❤

[@PandaFPV]

So we basically got crystal walls?

[@royksk]

Don’t make the mistake of a schoolgirl in the U.K. She mistakenly put her hands into a bucket of wet plaster of paris (should have been wet clay to make a mould) which then set. As mentioned, it heats on setting and her hands were badly burned. Despite surgeons' best efforts she lost 8 of her fingers and has scarring where skin has been taken for grafting. Sorry about this downer but thought it worth adding this warning. Great video with a clear, concise science lesson and none of the often unnecessary health and safety crap we have today. Retired Teacher.

[@raykent3211]

Yup, very exothermic.

[@gorillaau]

That was a terrible news story. Ouch... Just thinking about it.

[@smadaf]

"unnecessary health and safety crap" follows a story of losing eight fingers.

[@SteveFrenchWoodNStuff]

Very interesting. Thanks!

[@CuriosityShow]

Many thanks - lots more at kzbin.info -Rob

[@rannaghoremoumita926]

CaSO4.2h2o + ∆ ------ caso4 + 2h2o How plaster of paris (2caso4.1h2o)?

[@parthakalita192]

Really brada your teaching skills is amazing. .... thanks a lot for sharing your videos .....

[@malithirm8711]

Great video.

[@CuriosityShow]

Many thanks - lots more at kzbin.info - Rob

[@magnuswootton6181]

Calcium Sulphate wont adhere to itself in water, maybe u add a small amount of magnesium sulphate to it?

[@nehaljoshi8534]

Can you please tell which gas is released when gypsum is heated?? Btw loved ur video😊👍🏻

[@CuriosityShow]

Effectively it is water. The result is plaster so, when you add water, it converts back to gypsum - Rob

[@LiborTinka]

gypsum is calcium sulfate dihydrate, heating it drives off the water of crystallization, giving you the hemihydrate (Plaster of Paris) and finally anhydrous calcium sulfate with further heating, calcium sulfate will decompose into calcium oxide and sulfur trioxide - but this reaction is better done catalysed with e.g. silicon dioxide - this is how sulfuric acid was once made (the SO3 gas was reacted with water, forming sulfuric acid)

[@peter_castle]

Really awesome video! 0:40 en.wikipedia.org/wiki/Herringbone_(cloth) (Not to be confused with "hearing bone")

burdan malzeme hocamın annesine selamlarımı iletiyorum 1 slayt paylaşsan ölür müydün hocaaaaaaaa

[@iivoli]

GYPSUM BOARD IS GYPSIES!

[@dustytrayl]

Soylent Green is PEOPLE!! 😆

[@CountDrunkula]

And I use it in my beer to add sulphate. I'd love to set that on the curiosity show.

[@alext9067]

Explanation Needed

[@schr4nz]

beerandbrewing.com/dictionary/6KDwm8vWwW/gypsum/

[@primeminister1760]

Cool thx.

[@CuriosityShow]

Thanks, lots more at kzbin.info - Rob

[@r.srupaksharma6216]

😁😁😁😄😊😊😊😊😊😊😄

[@geekworthy7938]

And the award goes to Curiosity Show for the most hardcore illegal substance looking episode of a kids show ever!!! 🏆👏 👏 👏

[@DavidOfWhitehills]

Little known fact; their "Brown Sugar" episode never made it through the censors.

[@mdp5337]

@Acharacle & Achiltibuie: why? What's the story? I cannot find reference...