Calcium Hydroxide the material that immortalized human kind. | Daniela Murphy | TEDxLUCCA
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- čas přidán 27. 02. 2019
- A breathtaking speech about the reasons why human evolution can either spiral upward or collapse on itself if the past isn't constantly explored and conserved in order to build upon it. Riveting. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at www.ted.com/tedx
I used to teach this at an historic site where limestone was baked and processed. What a great talk she gave here. People asked me how the first people discovered this and my best guess was you just need to have a hot campfire on limestone for a while. After it cools the limestone below the ashes will be powdery calcium oxide. Let some rain fall on it and it slakes naturally, the heat from the exothermic reaction boiling the water, almost like reanimating the fire. People would definitely notice that. Then it starts to absorb CO2 from the air and creates a shell of lime plaster on top of the rough native limestone rock. The only thing I wish she hadn't said was that splashing the water on your skin during slaking will burn like fire. It won't burn like that, it will burn like drain cleaner since it can have a pH as high as 12.4. I wish I knew how early artisans protected themselves from the caustic burns or if injuries were just accepted as part of the job. You definitely never want to inhale calcium oxide dust because it will slake in your moist lungs and cause lifelong injury or death.
'like fire' = 'gives burns as if it were fire', which is close enough. It'll still remove your skin and hurt like blazes.
In conservation of Library books and documents, CaOH2 is used to deacidify paper. The acid is replaced with an alkaline reserve that elongates the shelf-life of these valuable documents
great shame the original version of her ted talk recording was taken down for a digital clean-up, got quite a resonance in terms of views and comments - still, ace talk, gives you a new focus on the history of things!
Glad to hear that. I was thinking it was a real shame only 7,000 have watched it but it must have been much more before being reloaded.
Wonderful, passionate, amazing speech!! It is impossible explain the lime cycle and the fantastic properties of this material betther than that! I am a fresco painter and I can precisely understand her passion for this technique and material.
This was the best explanation of how the lime cycle works.. thankyou
Great Talk!
A truly renaissance woman presents us with the quintessential technology of culture. The myth of the linear progress of mankind, is remarkably and eloquently exposed in Daniela's story of stone. A gratifying and startlingly solid manifestation of Karr’s maxim, "Plus ça change, ....plus c'est la même chose".
Can it be use for sugar making?
Finally an arts conservator on a stage!
Passion. It’s rare.
1 Kings 10:8 (KJV) Happy are thy men, happy are these thy servants, which stand continually before thee, and that hear thy wisdom.
Ok, how do you make it ? I'm confused why Ca OH2 is, a reactive chemical and KOH is just a catalyst Iwhat is the pure catalyst for of calcium, I'm guessing CaOH singular.
What is catayst
Its cement. Its just cement. Its a rock. Heat it up and it becomes cement. Then add with water its a liquid rock.
She is a bit of calcium oxide herself! Spouting a bit of power and fire to the masses. Truly profound, professor you are my inspiration.
Loved it. A fantasic speaker who know how to intrigue the public.
Yes, lets all clap
Wonderful
Bellissimo!
So proud of you Dany, you truly are a talented woman, love you baby!
Why the guitar
Cool 😎
Instead of making new concrete, seams like you can just; Bake old concrete and reuse the stuff.
That stuff is on my tortilla chips!😡
Sponsor by cal (Calcium hydroxide )$$$
I dunno, seems beautiful to me.
It must have seemed like the wrath of God when it rained.
she've lost a peace o maind...? :(