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## Re: [TowerTalk] Soil resistivity test done: Some questions

 To: Re: [TowerTalk] Soil resistivity test done: Some questions "David Robbins K1TTT" k1ttt@arrl.net Sat, 9 Sep 2006 19:49:17 -0000
 ```Actually ohm-m or ohm-cm is correct, a couple definitions that make it clearer: resistivity-(Also called specific resistance.) The electrical resistance per unit length and per unit reciprocal cross-sectional area of a given material at a specified temperature. It is also possible to define the resistivity of a substance as the resistance of a cube of that substance having edges of unit length, with the understanding that the current flows normal to opposite faces and is distributed uniformly over them. Resistivity is commonly expressed in units of ohm centimeters. The reciprocal of resistivity is conductivity. Resistivity - an intrinsic property of a material determining the materials resistance to the flow of current. Resistance in ohms is equal to the resistivity of the material multiplied by the cross sectional area of the material divided by the length of the material. Resistivity is frequently used to specify electrically active doping level and also as a measure of the ionic content of water. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net > -----Original Message----- > From: towertalk-bounces@contesting.com [mailto:towertalk- > bounces@contesting.com] On Behalf Of K8RI on TowerTalk > Sent: Saturday, September 09, 2006 19:34 > To: k1ttt@arrl.net; towertalk@contesting.com > Subject: Re: [TowerTalk] Soil resistivity test done: Some questions > > > > > > 'Resistivity' or 'Resistance'?? I am confused by the wording of some of > > your measurements... and since you don't give units I have to assume > > certain > > things. Note that 'resistance' is measured in ohms, 'resistivity' is in > > ohm-meters, or occasionally ohms-cm. > > Other than a nit...resistivity would be ohms per cubic CM, or cubic meter. > In electronics we used cm^3 but I'd guess in the electricall transmission > area it'd be m^3 > > Roger Halstead (K8RI and ARRL 40 year Life Member) > N833R - World's oldest Debonair CD-2 > www.rogerhalstead.com (Use return address from home page) > > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] Soil resistivity test done: Some questions, Beat Meier Re: [TowerTalk] Soil resistivity test done: Some questions, David Robbins K1TTT Re: [TowerTalk] Soil resistivity test done: Some questions, Beat Meier Re: [TowerTalk] Soil resistivity test done: Some questions, K8RI on TowerTalk Re: [TowerTalk] Soil resistivity test done: Some questions, David Robbins K1TTT <= Re: [TowerTalk] Soil resistivity test done: Some questions, Beat Meier Re: [TowerTalk] Soil resistivity test done: Some questions, David Robbins K1TTT