Cold water in rural India : matka(earthen ware)

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prkhitman
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Joined: 06/27/2009
matka.jpg
Ok so here's a little insight into how water is cooled in the earthen pots used in rural India.Thes pots go by the name of "matka"and they have been in use in India since the Indus Valley Civilisation. Modern versions have a tap!!Trust me the water u drink from these pots is cold.Atleast a few degrees cooler than it would be if u kept the water in a plastic bottle without any refrigeration. Here's wat i found out when i googled.(i daresay i could have explained but the language used here i think is clearer) "A matka is made of mud and has many minute pores (extremely small holes). No matter how tightly you pack the mud, these pores remain. It is through these pores that the water, placed inside the matka, oozes out. Now, to evaporate, the water needs to absorb heat, which will change it to vapour. The only way the water oozing out of the matka can turn to vapour is by absorbing heat from the liquid within the matka and the matka itself. Due to this process of continuous absorption of heat from the water inside the matka, in a few hours, this water becomes cool. Glass and metal do not have any pores. So the water placed inside glass and metal vessels cannot seep out and evaporate. Therefore, the water inside remains hot." source : www.pitara.com
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John (not verified)
Wow! I'm intrigued.

This is a very good contribution to our forum. Let me explain why I like it:
-It's easy to understand. Anyone who is familiar with evaporation's ability to cool will get this.
-And you added a picture (nice touch). I immediately get what it's about.
I followed the link that you provided though, and it was not immediately apparent to me where I could learn more. I would have preferred a different link, or perhaps a deeper link to information that is pertinent to the subject.
Thanks again. And, well done!
John

P.S.
I think if we cleaned up the grammar and provided a good link, it could move to the front page. We have an adsense program, but I know that you need additional motivation because my site still has small traffic. The quote may be to long too. Any SEO experts have an opinion? please chime in on the length of the quote.

prkhitman
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 06/27/2009
Ok here's anther

Ok here's anther link.
http://householdmatters-india.blogspot.com/2009/02/matkapot-water-filter...

It doesn't say how the matka works because quite frankly, anyone with basic knowledge of science would understand how evaporation works.But this link will show u another modern innovation.A matka with a filter!!!

Sorry about my English.

(Also when u check out that link u can see information on LED lighting which is way more efficient than conventional lighting!)

John (not verified)
Awesome, thanks.

Your English seems perfectly fine to me; this is a forum after all. I just meant that if we turn it into a proper article for the front page, we should should take a more proper tone.

Thanks for the links too, I'm reading them right now. LED is something I'd like to learn more about. Maybe you can help, I think you mentioned you're an engineer, is that correct?

John

prkhitman
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 06/27/2009
Well im training to be

Well im training to be one.
And i know enough to tell u how a LED work's and stuff.
Will be glad to help.
Thanks

prkhitman
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 06/27/2009
silver coins in water

The other day John asked me he had heard that people put silver coins in water to stop it from going bad.
So i did a bit of research and this is what i came up with.

I learned that due to their ionisation(i.e. the atoms lose one or many electrons depending on the valecy of the element) properties, metals like silver, copper gold and silver help disinfect water by retarding growth of microorganisms and preventing them from undergoing multiplication by cell division.
Here are a few links
1.http://www.copper.org.sg/v2/index.php/ourprog/detail/4/34/0/Tossing_copper_silver_coins_in_rivers_may_help_reduce_water_pollution
source: www.copper.org

2.This is a discussion on a forum.
http://forums.silverseek.com/archive/index.php/t-2543.html
soure: www.forums.silverseek.com
Hope that helped.Let me know if there's anything else i could do.

Thanks

John (not verified)
Thanks again prkhitman

You know, I actually heard of the silver and copper coins being used historically for Ocean voyages. The coins where placed into barrels of water before the days of modern technology. For some reason that stuck in my mind.

So when you mentioned the matkas, I started wondering, 'what else could we cool with earthen ware and evaporating water?' The obvious problem is that water will not stay fresh for more than a day or so and will begin to grow algea. There could be a good green-tech idea in here somewhere for our enginerring readers, but I'm not exactly sure what. In any event, I think it's a great idea to expose Americans and other to matkas, I personally was not aware of this practice and their ability to cool water.

Thanks again for sharing this information

regards,
John

prkhitman
User offline. Last seen 5 years 7 weeks ago. Offline
Joined: 06/27/2009
'what else could we cool with

'what else could we cool with earthen ware and evaporating water?'

That's got me thinking now.