Cooling things down

[cantaloup63]

Someone explain this to me. In ancient Egypt, they used to fill containers placed on the top of buildings with boiling water, which used to cool the building down

How does that work?

 

[Mw Roofline]

Where did u read that? Where did they get the kettles from anyway?

 

[Alarm]

When a liquid vaporizes rapidly, it expands quickly. The rising molecules of vapor abruptly increase their kinetic energy and this increase is drawn from the immediate surroundings of the vapor. These surroundings are therefore cooled.

 

[libby lou lou]

Maybe the building had to be cooled down slowly?

 

[sooey]

It probably doesn't, they were pretty thick them ancient egyptians.

 

[cantaloup63]

Where did u read that? Where did they get the kettles from anyway?

Read it in this book, in a chapter about cooling and refrigeration

 

[sooey]

When a liquid vaporizes rapidly, it expands quickly. The rising molecules of vapor abruptly increase their kinetic energy and this increase is drawn from the immediate surroundings of the vapor. These surroundings are therefore cooled.

That's describing something like an unvented cylinder exploding, where the pressurised water is suddenly released and flashes to steam, increasing it's volume by 1600 times.
It's not relevant to a tub of boiling water being left to cool.

 

[cantaloup63]

When a liquid vaporizes rapidly, it expands quickly. The rising molecules of vapor abruptly increase their kinetic energy and this increase is drawn from the immediate surroundings of the vapor. These surroundings are therefore cooled.

One would have thought that this would apply to the pots and not the building. But hey ho, maybe it worked.

 

[Alarm]

Hey, thats what it said in the Egyptian site

 

[Whitespirit66]

Where did they get the kettles from anyway?

Probably got their hot water from a Giza.

 

[Mw Roofline]

Where did they get the kettles from anyway?

Probably got their hot water from a Giza.

Terrible, just terrible

 

[Whitespirit66]

It's the way I tell 'em!

 

[Caoineadhcuchulainn515]

It probably doesn't, they were pretty thick them ancient egyptians.

I find it amazing some people still think the Egyptians built the Pyramids !!

 

[sooey]

I thought it was their slaves wot did that.

 

[Caoineadhcuchulainn515]

Apparently , there has never been found a single heiroglyph that depicts the building of the Pyramids. This from a race of people who's very existance and daily lives have been depicted in heiroglyphs since they could hold a tool !