I am reading my "newest favourite" book just now, the sort of book I can't wait to open at breakfast, and which keeps me at my coffee longer than usual. It's Heather Kinkade-Levario's
"Design for Water: Rainwater Harvesting, Stormwater Catchment and Alternate Water Reuse".
Sounds a bit, erm, DRY you say?
Anything but! Heather has a stimulating perspective and knowledge on the world of water conservation and on-site reuse which in today's shifting climate and increasing concerns about water access, management and use is very much needed. Not only is her book immediately applicable to designers in Mediterranean and more arid zones, but even here in Dublin Ireland. Water is a resource which is non-negotiable, and Heather's book offers plenty of ideas, technical advice and inspiration to sustainability system designers everywhere.
Comments
Each hydrogen nucleus is
Each hydrogen nucleus is bound to the central oxygen atom by a pair of electrons that are shared between them; chemists call this shared electron pair a covalent chemical bond. In H2O,83-640 exam only two of the six outer-shell electrons of oxygen are used for this purpose, leaving four electrons which are organized into two non-bonding pairs. The four electron pairs surrounding the oxygen tend to arrange themselves as far from each other as possible in order to minimize repulsions between these clouds of negative charge.MB2-632 exam This would ordinarily result in a tetrahedral geometry in which the angle between electron pairs (and therefore the H-O-H bond angle) is 109.5°. However, because the two non-bonding pairs remain closer to the oxygen atom, these exert a stronger repulsion against the two covalent bonding pairs,70-448 exam effectively pushing the two hydrogen atoms closer together. The result is a distorted tetrahedral arrangement in which the H-O-H angle is 104.5°.
Post new comment