On 8/21/06, Andy Medina <[EMAIL PROTECTED]> wrote:
On Sun, 20 Aug 2006, Richard King wrote:
> Hi,
>
> IIRC from A-level physics, a spark jumps 1 centimeter per
> 100kV in dry air, so a cloud-to-ground lightning bolt must be
> zillions of volts! (recently concerned - sailing in variable
> weather last week!).
So how do you explain the tree that explodes from a lighting
hit? :) It must be a Gazillion volts ! <vbg>
The explosive force comes from the water in the tree's sap turning
into super-heated steam by the heating effect of the current flow
through the trunk. The wood can't contain the pressure and bang!
--
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Dave J
In sunny Extremadura
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